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Sarkhosh, David, and Otman Farha Allan Nouri. "Twitter Analysis - Do Twitter Sentiments Correlate to Changes of Swedish Stock Prices?" Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208969.
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Stock market prediction is a problem that has undergone extensive research with many approaches and methods, such as mathematical models, machine learning methods et cetera. Another interesting approach is sentiment analysis, an approach takes the public opinion into account when predicting stock market prices. This method, combined with some machine learning techniques have proven effective when it comes to predict stock prices. This study determines whether this method is usable on demographics where information on public opinion does not come in abundance, in this instance the demographic of people who speak Swedish. The public sentiment is gathered by analyzing public opinion found on Twitter, and hourly stock prices for three companies were gathered. This data was combined and linear regression was performed to see if there does indeed exist a possible correlation between these data sets. The results showed that there does not appear to be a linear relation between public sentiment and changes in stock prices. The mean squared error of the data points indicate that the data points deviate to much from the regression line for the regression line to be usable as an accurate model. The limited amount of data on public sentiment led to the conclusion that Swedish Twitter flow is not usable as a source for extracting reliable information on public sentiment to be analyzed by any model.Att förutspå aktiemarknaden är ett aktuellt forskningsproblem. Maskininlärning, matematiska metoder och opinonsmätning är metoder för att mäta och förutspå förändringar av aktiepriser. Opinionsmätning är en metod som har visat sig vara effektiv för att förutspå aktiemarknaden. Den här studien undersöker om det finns en korrelation mellan den allmänna opinionen om ett företag och förändringar i företagets aktiepris i demografiskt sett mindre befolkningsgrupper, i detta fall Sverige och svensktalande. Allmännhetens inställning till tre olika företag mättes genom att analysera allmänhetens åsikter om företaget på den sociala medieplatformen Twitter. Aktieprisförändringen och opinionsdata samlades in timme för timme och linjär regression användes för att undersöka om det finns något samband mellan aktiepriset och allmänhetens åsikter. Resultaten blev att det inte verkar finnas något linjärt samband mellan den allmänna opinionen och förändringar i aktiepriserna. Det kvadratiska medelfelet visade att datapunkterna avviker för mycket från regressionslinjen för att opinionsmätning ska användas som en tillförlitlig modell. Den begränsade mängden opinionsdata ledde till slutsatsen att det Svenska Twitterflödet inte är användbart för att allmänhetens åsikter ska kunna användas för att förutspå aktieprisförändringar.
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Jonsson, Christoffer. "Statistical analysis of winddata regarding long-term correction." Thesis, Uppsala University, LUVAL, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121037.
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The procedure of determining if a site is suitable for wind power production requiresconvincing statistical data describing the long-term behavior of the average wind speed.This can be achieved by measuring the wind speed for a short time period, e.g. a year,and after that a Measure-Correlate-Predict (MCP) method can be performed. The shorttermmeasured wind data must be used in combination with a long-term referenceseries. This long-term reference series can be global reanalysis data reaching 20 to 30years back in time. In a MCP method different regression methods can be used. Aftercreating a long-term corrected wind data series, it is possible to analyze the conditionsat the investigated site. To be able to study the behavior of different reference series andregression methods, a model was created in MATLAB. As short-term wind speed dataVattenfall Wind Power supplied data from two measuring masts, Ringhals andOskarshamn, with maximum heights of 96 and 100 meters, respectively. From UppsalaUniversity data were supplied from a measuring mast near Marsta with maximummeasurement height of 29 meters.When creating these long-term corrected wind data series there were many methodsavailable. In this Master thesis methods such as Ordinary-Least-Square, Least-Absolute-Deviation and Reduced-Major-Axis regression methods have been used. With eachmethod three reference series were used in combination with the short-termmeasurement data. These were data from NCAR 850 hPa, NCAR 42-meter sigma leveland a confidential source.Regression methods in combination with reference series were studied and the deviationfrom mean wind speed was obtained for each of these cases. Studies were performed onhow the length of the short-term measurement series affected the deviation from themeasured mean wind speed. It was also investigated if the time of the year had anyinfluence on the measurements.The general conclusion drawn after performing the above-mentioned studies was thatthe NCAR 850 hPa wind speed data and the Reduced-Major-Axis regression methodgave the smallest deviation from the measured mean wind speed in most cases. It wasalso concluded that when a short-term measurement series reached 10 to 14 monthsthere was a significant decrease in deviation from the mean wind speed, regardless ofreference series or method used. Calculations from the model regarding seasonaldependence stated that there was a slight dependency on which period of the year ameasurement was performed.
I processen att bedöma om en plats är lämplig för utbyggnad av vindkraft måste detfinnas övertygande statistiska data som beskriver den genomsnittliga vindhastighetenöver en längre tid. Genom att utföra vindhastighetsmätningar på den tänkta platsenunder en kortare tid, exempelvis ett år, och därefter tillämpas en Measure-Correlate-Predict (MCP) metod i kombination med en långtidsreferens, exempelvis en globalmodell som sträcker sig 20 till 30 år bakåt i tiden kan detta göras. I en MCP-metod kanolika typer av regressionsmetoder användas. När en långtidskorrigerad vinddataseriefinns tillgänglig kan dess beteende på den tänkta platsen analyseras. För att kunna göradetta för flera olika typer av referensserier och regressionsmetoder skapades en modell iMATLAB. Två vinddataserier erhölls från Vattenfall Vindkraft. Dessa var Ringhals ochOskarshamn med högsta mäthöjd på 96 respektive 100 meter. En ytterligarevinddataserie erhölls av Uppsala Universitet från en mätmast nära Marsta med högstamäthöjd på 29 meter.Det fanns flera metoder tillgängliga för att skapa de långtidskorrigeradevinddataserierna. I det här examensarbetet har metoderna Ordinary-Least-Square-,Least-Absolute-Deviation- och Reduced-Major-Axis regressioner använts. För varjemetod testades tre referensserier i kombination med de kortare vinddataserierna. Dessavar NCAR 850 hPa vindhastigheter, NCAR 42 meters sigmanivå vindhastigheter ochannan meteorologisk data.Regressionsmetoderna utvärderades genom att avvikelsen från de kortare mätseriernasmedelvindhastigheter beräknades. Det undersöktes också hur längden på användvinddata från de kortare mätserierna påverkade avvikelsen i medelvindhastighet och omdet fanns något säsongsberoende på när under året som mätningen av vinddata vargjord.Slutsatserna från undersökningarna var att NCAR 850 hPa vindhastigheter ochregressionsmetoden Reduced-Major-Axis generellt gav de lägsta avvikelserna frånuppmätt medelvindhastighet. Slutsatser kunde också dras om längden av användmätdata. Det var tydligt att oavsett referensserie och regressionsmetod uppstod enminskningen i avvikelse från medelvindhastigheten mellan 10 till 14 månaders längd påmätserien. Resultat angående säsongsberoende kunde påvisas i form av avvikelsermellan mätningar gjorda under olika tidpunkter på året. Storlek och tecken påavvikelsen berodde på vilken referensserien i kombination med regressionsmetod somanvändes.
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Chenge, Violet Wambui. "The correlate between fertility and landholding among rural women in kenya: a multivariate analysis." University of the Western Cape, 2013. http://hdl.handle.net/11394/4038.
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Masters of ScienceThe present study is an understanding of the relationship that exists between landholding and the reproductive behaviour of rural women in Kenya. Traditional women have rights to cultivate land as well as control income from the resulting crop production but rarely have rights to allocate or alienate land. Men are the rightful owners of the land. When the rightful owner person passes away, the eldest son of the family automatically takes ownership of the land and subsequent care of the family. This period of land ownership supported high fertility rates. However, in current spaces this practice has changed. Land is scarce and people are opting for other alternatives of limiting their family sizes. The aim of the study is to address the dissimilar changes of fertility behaviour among women in rural Kenya. Particularly, landholdings and low fertility behaviour, focusing on how this change happened. Data used is from the Kenya Demographic and Health Survey (KDHS) 2008/2009. We acquire a representative sample size of 6761 women age 15-49 from the data. A multiplicity of statistical parameters like chi-square test, p-value, logistic regression, and multivariate analysis are adopted. In this regard, the relationship that exists between fertility and landholdings leads to large family sizes. In addition, land decrease has lead to the search of alternatives such as education, employment, and increase in age at marriage. The introduction of these factors has promoted smaller family sizes. This study is immensely useful for the policy makers, planners and other interested stakeholders in population and development spheres in this juncture.
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Lim, Emilia Lee Yian. "miRNA sequence analysis reveals cancer subtypes that correlate with tumour characteristics and patient outcomes." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57440.
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microRNAs (miRNAs) are small 17-25nt RNA molecules that regulate gene expression at the post-transcriptional level. A given miRNA may have up to several hundred gene targets, and 60% of messenger RNAs (mRNAs) have binding sites for multiple miRNAs in their 3’- untranslated regions (UTRs). miRNAs have been implicated in the regulation of numerous biological processes, including cellular growth, differentiation and apoptosis, and miRNA dysregulation has been associated with diseases including cancers. miRNAs are stable and robust in a variety of fresh and preserved human tissues, and thus are useful in disease classification and subtype identification. They have also been used to infer dysregulation of regulatory pathways.
With the aims of identifying cancer subtypes and relating these to clinical covariates and studying miRNA-mediated regulation, I analyzed miRNA-seq and mRNA-seq expression profiles from diffuse large B-cell lymphomas (DLBCL), pediatric acute myeloid leukemias (AML) and pediatric malignant rhabdoid tumours (MRT).
My analyses provided comprehensive characterization of miRNA expression profiles, revealed molecular sub-groups within cancer types, novel miRNA species, putative miRNA prognostic markers, and candidate functional miRNA:mRNA interactions. Of note, I discovered a novel miRNA (miR-10393-3p) that was preferentially expressed in DLBCL samples, and further revealed that it could target genes involved in chromatin modification. I also found that the miR-106a-363 cluster was not only significantly associated with inferior patient outcomes in pediatric AML, but may also contribute to treatment resistance by modulating the expression of genes involved in oxidative phosphorylation. In addition, I performed hierarchical clustering of MRT miRNA profiles together with those of 11,753 other samples representing 36 cancer types and 26 normal tissue types. This analysis demonstrated that MRT samples are most similar to cerebellum and DLBCL samples, possibly reflecting a related cell of origin as these samples. Overall, the research presented in this thesis constitutes a step forward in our understanding of miRNA dysregulation within cancer types and identifies miRNAs that could be useful prognostic markers in guiding treatment selection.Science, Faculty of
Graduate
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Anderson, Kent W. "Cognitive and Attributional Correlates of Depression: An Analysis of the Redundancy Between Beck•s Cognitive Triad and Seligman's Attributional Styles." DigitalCommons@USU, 1990. https://digitalcommons.usu.edu/etd/5981.
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The purpose of this study was to examine the degree vi of redundancy between two prominent cognitive theories of depression: Beck's cognitive triad and Seligrnan's attributional triad. Three hundred and eighteen subjects were recruited from nine different psychology courses at Utah State University and affiliated locations across the state. Subjects completed the Cognitive Triad Inventory (CTI), the Attributional Style Questionnaire (ASQ), and the Beck Depression Inventory (BDI). Results indicate that the three CTI subscales (self, world, and future) and the three ASQ subscales (internal, global, and stable) did not correlate sufficiently to merit integration across measures. However, factor analyses reduced the three CTI constructs to two factors: a security/insecurity factor and the presence/absence of stressors. The ASQ also was reducible to two factors: a global/stable factor and an internal factor. The new CTI and ASQ factors could predict depression scores on the BDI equally as well as the CTI subscales and ASQ subscales, respectively.
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Mageed, Mahmoud. "MORPHOMETRIC ANALYSIS OF THE SHEEP THORACOLUMBAR SPINE USING COMPUTED TOMOGRAPHY AND A COMPARISON WITH THE HUMAN CORRELATE." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-155677.
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Sheep are commonly used as animal model for in vivo testing of new spinal implants as well as surgical procedures. Therefore, extensive knowledge of the precise morphometry and biomechanics features of sheep spine is crucial for experimental design and interpretation of results obtained in these trials. Little is known about the sheep spine. Therefore, the current study, which comprises of two parts, aimed to gain more knowledge concerning the morphometry of sheep thoracolumbar spine. The first part aimed to document the morphometry of the sheep thoracolumbar vertebrae and to assess the feasibility of using sheep lumbar vertebrae as a model for human spine researches based on morphometric comparison. For this reason, computed tomographic (CT) scanning was carried out in five clinically healthy female Merino sheep (2 years, 62 ± 5.3 kg) under general anaesthesia. CT images were reformatted with 1-mm slice thickness from T2 through L6. The CT images were reformatted in transverse and sagittal planes using multiplaner reconstruction algorithm. Subsequently, CT images were transferred to a workstation and reviewed with dedicated software for measuring the dimensions of the vertebral bodies, spinal canal, intervertebral disc, and pedicles. Based on the generated morphometric data of the sheep lumbar vertebrae, four spinal indices and Pavlov’s ratio were calculated as well as the volume of the vertebral bodies. The spinal indices were concavity index, endplate index, spinal canal index and pedicle index. For measuring vertebral body volume, the transverse CT data were reformatted in 5-mm slice thickness and imported in dedicated software. Thereafter, the four spinal indices and the volume were compared to human published data. The parameter was defined comparable if the ratio sheep/human of each individual vertebra showed variation less than 20%. The second part of the current work aimed to provide quantitative morphometric data of the thoracolumbar dural sac and describe the anatomical relationship between the dural sac and its surrounding osseous structures of the spine. To achieve these aims, computed assisted myelography was carried out in five adult female blackhead sheep (2.0 ± 0.4 years, 80.6 ± 28.7 kg) under general anaesthesia. Transverse images were acquired with 2-mm slice thickness from T1 to L6. Sagittal and transverse diameters and cross-sectional area of the dural sac and the spinal canal were measured on CT images. To determine the anatomical relationship between the dural sac and osseous structures of spinal canal, the pedicle-dural sac distance and available space for dural sac were calculated. The morphometric data showed that the sheep thoracolumbar vertebral bodies and the spinal canal were wider than they were deep, most obviously in the lumbar vertebrae. The intervertebral discs were as much as 57.4% thicker in the lumbar than in the thoracic spine. The pedicles were higher and longer than they were wide over the entire thoracolumbar spine. Compared to humans, sheep lumbar vertebral body volumes were 48.6% smaller. The comparison of absolute values between both species revealed that sheep had smaller, longer and narrower vertebral bodies, thinner intervertebral discs, narrower spinal canal and narrower, higher pedicles. The comparison of the spinal indices showed a good comparability to human in terms of the vertebral endplate and spinal canal. The results of the second parts showed that the dural sac area covered 45.9% and 49.0% of the thoracic and lumbar vertebral canal area, respectively, and it is significantly (positive) correlated with the transverse diameter as well as area of the vertebral canal. The pedicledural sac distance in the lumbar vertebrae was up to 15.8% larger than in the thoracic ones. The clinical relevance of the current study, the sheep lumbar spine has good comparability to that of humans in terms of the vertebral endplate regions and spinal canal, suggesting that a sheep spinal model would be appropriate for studying artificial intervertebral discs, implantation of intervertebral fusion, etc. With regard to sheep pedicles, can be used as a model for spinal implant conditioned by adaptation of implant size to sheep pedicel dimensions. The lumbar vertebral canal shows more space for the dural sac, which seems to be safer for testing fixation spinal implantsSchafe werden häufig als Tiermodell für In-vivo-Versuche verwendet, um neue Wirbelsäulenimplantate sowie chirurgische Prozeduren zu testen. Daher ist die umfassende Kenntnis der präzisen Morphometrie und der biomechanischen Merkmale der Schafwirbelsäule entscheidend für das experimentelle Design und die Interpretation der Ergebnisse in den Studien. Es sind wenige Daten über die Schafwirbelsäule bekannt. Auf Grund dessen zielt die aktuelle Studie darauf ab, mehr Wissen über die Morphometrie der thorakolumbalen Wirbelsäule von Schafen zu gewinnen. Der erste Teil dieser Studie soll die Morphometrie der Brust- und Lendenwirbelsäule dokumentieren. Das Ziel besteht darin, die Verwendung von Schaflendenwirbeln als Modell für die menschliche Wirbelsäule im morphometrischen Vergleich beurteilen zu können. Aus diesem Grund wurden Computertomographische Untersuchungen (CT) von fünf klinisch gesunden weiblichen Merino-Schafen (2 Jahre, 62 kg ± 5,3 kg) unter Allgemeinanästhesie durchgeführt. Die CT-Bilder wurden mit einer Schichtdicken von 1 mm aus T2 bis L6 gewonnen. Anschließend wurden die CT-Bilder in der transversalen und sagittalen Ebene multiplanar reformatiert. Danach wurden Messungen und Bewertungen mit einer geeigneten Software an den Wirbelkörpern, Wirbelkanälen, Bandscheiben und Pedikeln durchgeführt. Basierend auf den erzeugten morphometrischen Daten der Schaflendenwirbel wurden vier Wirbelsäulen-Indizes und Pavlov’s-ratio sowie das Volumen der Wirbelkörper berechnet. Die Wirbelsäulen-Indizes stellten den Konkavitäts-, Endplatten-, Spinalkanal- und Pedikel-Index dar. Für die Messung des Volumens von Wirbelkörpern wurden die transversalen CT-Daten in 5 mm Schichtdicke formatiert und in geeignete Software eingefügt. Danach wurden die vier Indizes-Wirbelsäulen und das Volumen der Lendenwirbelkörper mit den veröffentlichten Daten von menschlichen Wirbeln verglichen. Sie wurden als „vergleichbar“ definiert, wenn das Verhältnis Schaf-Mensch jedes einzelnen Wirbels Variationen von weniger als 20 % aufwies. Der zweite Teil der vorliegenden Arbeit hat zum Ziel, quantitative morphometrische Daten des thorakolumbalen Duralsacks zu ermitteln. Weiterhin sollen die anatomischen Beziehungen zwischen dem Duralsack und seinen umliegenden knöchernen Strukturen der Wirbelsäule beschrieben werden. Dazu wurden CT-Myelographien an fünf erwachsenen weiblichen Schwarzkopfschafen (2 Jahre ± 0,4 Jahre, 80,6 kg ± 28,7 kg) unter Allgemeinanästhesie durchgeführt. Transversale CT-Bilder wurden mit 2 mm Schichtdicke von T1 bis L6 gemessen. Sagittal- und Transversal-Durchmesser sowie die Querschnittsfläche von Duralsack und Wirbelkanal wurden auf CT-Bildern gemessen. Um die anatomische Beziehung zwischen dem Duralsack und den knöchernen Strukturen des Wirbelkanals zu ermitteln, wurden der Pedikel-Duralsack-Abstand und das Platzangebot für den Duralsack berechnet. Die Wirbelkörper und der Wirbelkanal der ovinen thorakolumbalen Wirbelsäule sind breiter als tief, vor allem im Bereich der Lendenwirbel. Die Bandscheiben sind in der Lendenwirbelsäule 57,4 % dicker als in der Brustwirbelsäule. Die Pedikel der Brust- und Lendenwirbelsäule waren höher und länger als breit. Im Vergleich zum Menschen ist das Volumen von Schaflendenwirbelkörpern 48,6 % kleiner. Der Vergleich der absoluten Werte zwischen den beiden Spezies ergab, dass Schafe kleinere, längere und schmalere Wirbelkörper, dünnere Bandscheiben, einen schmaleren Spinalkanal und schmalere, höhere Pedikel besitzen. Der Vergleich der Wirbelsäulen-Indizes zeigte eine gute Vergleichbarkeit mit menschlichen Wirbelendplatten und Wirbelkanälen. Im zweiten Teil der Studie konnte festgestellt werden, dass die Duralsackfläche 45,9 % des Brustwirbelkanals und 49,0 % des Lendenwirbelkanals einnimmt. Die Duralsackfläche korreliert deutlich positiv mit dem Querdurchmesser und der Fläche des Wirbelkanals. Der Pedikel-Duralsack-Abstand in der Lendenwirbelsäule war bis zu 15,8 % größer als in der Brustwirbelsäule
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Mageed, Mahmoud [Verfasser], and Walter [Gutachter] Brehm. "Morphometric analysis of the sheep thoracolumbar spine using computed tomography and a comparison with the human correlate / Mahmoud Mageed ; Gutachter: Walter Brehm." Leipzig : Universitätsbibliothek Leipzig, 2014. http://d-nb.info/1239421680/34.
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Klinkert, Rickard. "Uncertainty Analysis of Long Term Correction Methods for Annual Average Winds." Thesis, Umeå universitet, Institutionen för fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-59690.
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For the construction of a wind farm, one needs to assess the wind resources of the considered site location. Using reference time series from numerical weather prediction models, global assimilation databases or observations close to the area considered, the on-site measured wind speeds and wind directions are corrected in order to represent the actual long-term wind conditions. This long-term correction (LTC) is in the typical case performed by making use of the linear regression within the Measure-Correlate-Predict (MCP) method. This method and two other methods, Sector-Bin (SB) and Synthetic Time Series (ST), respectively, are used for the determination of the uncertainties that are associated with LTC.The test area that has been chosen in this work, is located in the region of the North Sea, using 22 quality controlled meteorological (met) station observations from offshore or nearby shore locations in Denmark, Norway and Sweden. The time series that has been used cover the eight year period from 2002 to 2009 and the year with the largest variability in the wind speeds, 2007, is used as the short-term measurement period. The long-term reference datasets that have been used are the Weather Research and Forecast model, based on both ECMWF Interim Re-Analysis (ERA-Interim) and National Centers for Environmental Prediction Final Analysis (NCEP/FNL), respectively and additional reference datasets of Modern Era Re-Analysis (MERRA) and QuikSCAT satellite observations. The long-term period for all of the reference datasets despite QuikSCAT, correspond to the one of stations observations. The QuikSCAT period of observations used cover the period from November 1st, 1999 until October 31st, 2009.The analysis is divided into three parts. Initially, the uncertainty connected to the corresponding reference dataset, when used in LTC method, is investigated. Thereafter the uncertainty due to the concurrent length of the on-site measurements and reference dataset is analyzed. Finally, the uncertainty is approached using a re-sampling method of the Non-Parametric Bootstrap. The uncertainty of the LTC method SB, for a fixed concurrent length of the datasets is assessed by this methodology, in an effort to create a generic model for the estimation of uncertainty in the predicted values for SB.The results show that LTC with WRF model datasets based on NCEP/FNL and ERA-Interim, respectively, is slightly different, but does not deviate considerably in comparison when comparing with met station observations. The results also suggest the use of MERRA reference dataset in connection with long-term correction methods. However, the datasets of QuikSCAT does not provide much information regarding the overall quality of long-term correction, and a different approach than using station coordinates for the withdrawal of QuikSCAT time series is preferred. Additionally, the LTC model of Sector-Bin is found to be robust against variation in the correlation coefficient between the concurrent datasets. For the uncertainty dependence of concurrent time, the results show that an on-site measurement period of one consistent year or more, gives the lowest uncertainties compared to measurements of shorter time. An additional observation is that the standard deviation of long-term corrected means decreases with concurrent time. Despite the efforts of using the re-sampling method of Non-Parametric Bootstrap the estimation of the uncertainties is not fully determined. However, it does give promising results that are suggested for investigation in further work.För att bygga en vindkraftspark är man i behov av att kartlägga vindresurserna i det aktuella området. Med hjälp av tidsserier från numeriska vädermodeller (NWP), globala assimileringsdatabaser och intilliggande observationer korrigeras de uppmätta vindhastigheterna och vindriktningarna för att motsvara långtidsvärdena av vindförhållandena. Dessa långtidskorrigeringsmetoder (LTC) genomförs generellt sett med hjälp av linjär regression i Mät-korrelera-predikera-metoden (MCP). Denna metod, och två andra metoder, Sektor-bin (SB) och Syntetiska tidsserier (ST), används i denna rapport för att utreda de osäkerheter som är knutna till långtidskorrigering.Det testområde som är valt för analys i denna rapport omfattas av Nordsjöregionen, med 22 meteorologiska väderobservationsstationer i Danmark, Norge och Sverige. Dessa stationer är till största del belägna till havs eller vid kusten. Tidsserierna som används täcker åttaårsperioden från 2002 till 2009, där det året med högst variabilitet i uppmätt vindhastighet, år 2007, används som den korta mätperiod som blir föremål för långtidskorrigeringen. De långa referensdataseten som använts är väderprediktionsmodellen WRF ( Weather Research and Forecast Model), baserad både på data från NCEP/FNL (National Centers for Environmental Prediciton Final Analysis) och ERA-Interim (ECMWF Interim Re-analysis). Dessutom används även data från MERRA (Modern Era Re-Analysis) och satellitobservationer från QuikSCAT. Långtidsperioden för alla dataset utom QuikSCAT omfattar samma period som observationsstationerna. QuikSCAT-datat som använts omfattar perioden 1 november 1999 till 31 oktober 2009.Analysen är indelad i tre delar. Inledningsvis behandlas osäkerheten som är kopplad till referensdatans ingående i långtidskorrigeringsmetoderna. Därefter analyseras osäkerhetens beroende av längden på den samtidiga datan i referens- och observationsdataseten. Slutligen utreds osäkerheten med hjälp av en icke-parametrisk metod, en s.k. Bootstrap: Osäkerheten i SB-metoden för en fast samtidig längd av tidsserierna från observationer och referensdatat uppskattas genom att skapa en generell modell som estimerar osäkerheten i estimatet.Resultatet visar att skillnaden när man använder WRF-modellen baserad både på NCEP/FNL och ERA-Interim i långtidskorrigeringen är marginell och avviker inte markant i förhållande till stationsobservationerna. Resultatet pekar också på att MERRA-datat kan användas som långtidsreferensdataset i långtidsdkorrigeringsmetoderna. Däremot ger inte QuikSCAT-datasetet tillräckligt med information för att avgöra om det går att använda i långtidskorrigeringsmetoderna. Därför föreslås ett annat tillvägagångssätt än stationsspecifika koordinater vid val av koordinater lämpliga för långtidskorrigering. Ytterligare ett resultat vid analys av långtidskorrigeringsmetoden SB, visar att metoden är robust mot variation i korrelationskoefficienten.Rörande osäkerhetens beroende av längden på samtidig data visar resultaten att en sammanhängande mätperiod på ett år eller mer ger den lägsta osäkerheten i årsmedelvindsestimatet, i förhållande till mätningar av kortare slag. Man kan även se att standardavvikelsen av de långtidskorrigerade medelvärdena avtar med längden på det samtidiga datat. Den implementerade ickeparametriska metoden Bootstrap, som innefattar sampling med återläggning, kan inte estimera osäkerheten till fullo. Däremot ger den lovande resultat som föreslås för vidare arbete.
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Kittleman, Shaw E. "An analysis of the roles performed by public relations practitioners of the Council for Christian Colleges and Universities and how they correlate with Grunig's four models of public relations." Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1379436.
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An ongoing concern within the young field of public relations is the profession's lack of acceptance. In general, the literature agrees that public relations practitioners should have a "seat at the table" within top management though many scholars and professionals feel this has not yet occurred, especially within higher education. This would tend to suggest that practitioners are not yet in the managerial role or not following the two-way models of public relations. However, public relations roles and models within education have not been researched as heavily, especially in institutions of higher education or Christian higher education.This study attempts to gauge the readiness of public relations practitioners within Christian higher education for a seat at the decision table, through the use of role theory and the application of Grunig's four public relations models. Twenty-seven senior public relations practitioners from member institutions of the Council for Christian Colleges and Universitiesformed the sample for this study. Q methodology was used to elicit practitioner perceptions of Grunig's four models of public relations. A survey was employed to determine which of Broom and Smith's four public relations roles they perform. Correlation was used to compare model perceptions with role performance.Two factors, the Cooperators and the Protectors, emerged from this study's Q sort, indicating general agreement with Grunig's two-way models of public relations. Additionally, the sample of senior CCCU public relations practitioners indicated performing tasks most related to the expert prescriber and communications technician roles. However, there was no significant relationship between the Q factors and role performance.Department of Journalism
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Nunn, Martha E. "Influence diagnostics for correlated data /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9590.
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Oliveira, Irene. "Correlated data in multivariate analysis." Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401414.
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After presenting (PCA) Principal Component Analysis and its relationship with time series data sets, we describe most of the existing techniques in this field. Various techniques, e.g. Singular Spectrum Analysis, Hilbert EOF, Extended EOF or Multichannel Singular Spectrum Analysis (MSSA), Principal Oscillation Pattern Analysis (POP Analysis), can be used for such data. The way we use the matrix of data or the covariance or correlation matrix, makes each method different from the others. SSA may be considered as a PCA performed on a lagged versions of a single time series where we may decompose the original time series into some main components. Following SSA we have its multivariate version (MSSA) where we try to augment the initial matrix of data to get information on lagged versions of each variable (time series) and so past (or future) behaviour can be used to reanalyse the information between variables. In POP Analysis a linear system involving the vector field is analysed, xt+1=Axt+nt, in order to “know” xt at time t+1 given the information from time t. The matrix A is estimated by using not only the covariance matrix but also the matrix of covariances between the systems at the current time and at lag 1. In Hilbert EOF we try to get some (future) information from the internal correlation in each variable by using the Hilbert transform of each series in a augmented complex matrix with the data themselves in the real part and the Hilbert time series in the imaginary part Xt + XtH. In addition to all these ideas from the statistics and other literature we develop a new methodology as a modification of HEOF and POP Analysis, namely Hilbert Oscillation Patterns (HOP) Analysis or the related idea of Hilbert Canonical Correlation Analysis (HCCA), by using a system, xHt = Axt + nt. Theory and assumptions are presented and HOPS results will be related with the results extracted from a Canonical Correlation Analysis between the time series data matrix and its Hilbert transform. Some examples will be given to show the differences and similarities of the results of the HCCA technique with those from PCA, MSSA, HEOF and POPs. We also present PCA for time series as observations where a technique of linear algebra (PCA) becomes a problem in function analysis leading to Functional PCA (FPCA). We also adapt PCA to allow for this and discuss the theoretical and practical behaviour of using PCA on the even part (EPCA) and odd part (OPCA) of the data, and its application in functional data. Comparisons will be made between PCA and this modification, for the reconstruction of data sets for which considerations of symmetry are especially relevant.
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Dunovska, Jolanta. "Lietuvos mokėjimų balansas: analizė ir perspektyvos." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20090204_112819-98560.
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Baigiamajame magistro darbe nagrinėjamas Lietuvos nacionalinis mokėjimo balansas, jo struktūra, reguliavimo metodai, plačiau nagrinėjama einamoji mokėjimo balanso sąskaita ir jos deficitas. Atliekama statistinių nacionalinio mokėjimų balanso duomenų analizė nuo 1998 iki 2007 metų. Vertinama mokėjimų balanso sąskaitų (einamosios, kapitalo, finansinės) tarpusavio priklausomybė bei nagrinėjamas ryšys visų mokėjimų balanso sąskaitų su BVP. Galiausiai atliekamas nacionalinio mokėjimų balanso prognozavimas slenkančio vidurkio bei ekponentinio išlyginimo metodai, kad galima būtų numatyti jo perspektyvas. Išnagrinėjus teorinius ir praktinius Lietuvos mokėjimo balanso bei einamosios sąskaitos aspektus, pateikiamos išvados ir siūlymai.In this final master work under consideration are Lithuania national payments balance, its structure and regulation methods. Enlarge under consideration are current payments account and its deficit. Statistical national payments balance data analysis is executable from 1998 to 2007. Payments balance accounts (current, fund, financial) interdependence are well considered and relation common balance of payments account with GDP is pending in this work. At last national balance of payments prognostication is feasable in few methods to see its perspectives in future. After theoretical and practical aspects inspecting, finding and offering are proposed.
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Siannis, Fotios. "Sensitivity analysis for correlated survival models." Thesis, University of Warwick, 2001. http://wrap.warwick.ac.uk/78861/.
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In this thesis we introduce a model for informative censoring. We assume that the joint distribution of the failure and the censored times depends on a parameter δ, which is actually a measure of the possible dependence, and a bias function B(t,θ). Knowledge of δ means that the joint distribution is fully specified, while B(t,θ) can be any function of the failure times. Being unable to draw inferences about δ, we perform a sensitivity analysis on the parameters of interest for small values of δ, based on a first order approximation. This will give us an idea of how robust our estimates are in the presence of small dependencies, and whether the ignorability assumption can lead to misleading results. Initially we propose the model for the general parametric case. This is the simplest possible case and we explore the different choices for the standardized bias function. After choosing a suitable function for B(t,θ) we explore the potential interpretation of δ through it's relation to the correlation between quantities of the failure and the censoring processes. Generalizing our parametric model we propose a proportional hazards structure, allowing the presence of covariates. At this stage we present a data set from a leukemia study in which the knowledge, under some certain assumptions, of the censored and the death times of a number of patients allows us to explore the impact of informative censoring to our estimates. Following the analysis of the above data we introduce an extension to Cox's partial likelihood, which will call "modified Cox's partial likelihood", based on the assumptions that censored times do contribute information about the parameters of interest. Finally we perform parametric bootstraps to assess the validity of our model and to explore up to what values of parameter δ our approximation holds.
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Wan, Lai-mei. "Ruin analysis of correlated aggregate claims models." Thesis, Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B30705708.
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Li, Derek Z. "Statistical analysis of correlated fossil fuel securities." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69516.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 36).
Forecasting the future prices or returns of a security is extraordinarily difficult if not impossible. However, statistical analysis of a basket of highly correlated securities offering a cross-sectional representation of a particular sector can yield information that is potentially tradable. Securities related to the fossil fuels industry are used as the basis of a practical application to two distinct forecasting techniques. The first method, forecasting using conditional multivariate Gaussian statistics, was shown to yield, in a relative sense, the best results for those securities which exhibited a high correlation with the rest of the basket. For the second method, principal component analysis was done on a basket of commodity futures to reveal a small number of dominant factors governing the movements of the portfolio. Autoregressive models were then applied to both the factors and futures, but results showed both to be essentially Markov processes.
by Derek Z. Li.
S.B.
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Sutradhar, Santosh C. "Classification of a correlated binary observation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0001/MQ36183.pdf.
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Martínez-García, Marina. "Statistical analysis of neural correlates in decision-making." Doctoral thesis, Universitat Pompeu Fabra, 2014. http://hdl.handle.net/10803/283111.
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We investigated the neuronal processes which occur during a decision-
making task based on a perceptual classi cation judgment.
For this purpose we have analysed three di erent experimental paradigms
(somatosensory, visual, and auditory) in two di erent species (monkey and
rat), with the common goal of shedding light into the information carried by
neurons.
In particular, we focused on how the information content is preserved in
the underlying neuronal activity over time. Furthermore we considered how
the decision, the stimuli, and the con dence are encoded in memory and,
when the experimental paradigm allowed it, how the attention modulates
these features. Finally, we went one step further, and we investigated the
interactions between brain areas that arise during the process of decision-
making.Durant aquesta tesi hem investigat els processos neuronals que es pro- dueixen durant tasques de presa de decisions, tasques basades en un ju- dici l ogic de classi caci o perceptual. Per a aquest prop osit hem analitzat tres paradigmes experimentals diferents (somatosensorial, visual i auditiu) en dues espcies diferents (micos i rates), amb l'objectiu d'il.lustrar com les neurones codi quen informaci on referents a les t asques. En particular, ens hem centrat en com certes informacions estan cod- i cades en l'activitat neuronal al llarg del temps. Concretament, com la informaci o sobre: la decisi o comportamental, els factors externs, i la con- ana en la resposta, b e codi cada en la mem oria. A m es a m es, quan el paradigma experimental ens ho va permetre, com l'atenci o modula aquests aspectes. Finalment, hem anat un pas m es enll a, i hem analitzat la comu- nicaci o entre les diferents arees corticals, mentre els subjectes resolien una tasca de presa de decisions.
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Sheble, Angela T. "Correlates of weight in adolescents : a path analysis." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001743.
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Meddis, Alessandra. "Inference and validation of prognostic marker for correlated survival data with application to cancer." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASR005.
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Les données de survie en grappes sont souvent recueillies dans le cadre de la recherche médicale. Elles sont caractérisées par des corrélations entre des observations appartenant à un même groupe. Ici, nous discutons des extensions a des données en grappes dans différents contextes : évaluation de la performance d'un biomarqueur candidat, et l’estimation de l'effet du traitement dans une méta-analyse sur données individuels (IPD) avec risques concurrents. La première a été motivée par l'étude IMENEO, une méta-analyse où l'intérêt portait sur la validité pronostique des cellules tumorales circulantes (CTCs). Notre objectif était de déterminer dans quelle mesure les CTCs discriminent les patients qui sont morts de ceux qui ne l'ont pas fait dans les t-années, en comparant des individus ayant le même stade de tumeur. Bien que la courbe ROC dépendante du temps ait été largement utilisée pour la discrimination des biomarqueurs, il n'existe pas de méthodologie permettant de traiter des données en grappes censurées. Nous proposons un estimateur pour les courbes ROC dépendantes du temps et pour l'AUC lorsque les temps d'évènements sont correlés. Nous avons employé un modèle de fragilité partagée pour modéliser l'effet des covariables et du biomarqueur sur la réponse afin de tenir compte de l'effet de la grappe. Une étude de simulation a été réalisée et a montré un biais négligeable pour l'estimateur proposé et pour un estimateur non paramétrique fondé sur la pondération par la probabilité inverse d’être censuré (IPCW), tandis qu'un estimateur semi-paramétrique, ignorant la structure en grappe est nettement biaisé.Nous avons également considéré une méta-analyse IPD pour quantifier le bénéfice de l'ajout de la chimiothérapie à la radiothérapie sur chaque risque concurrent pour les patients avec un carcinome nasopharyngien . Les recommandations pour l'analyse des risques concurrents dans le cadre d'essais cliniques randomisés sont bien établies. Étonnamment, aucune recommendation n'a encore été proposée pour l’anlayse d'une méta-analyse IPD avec les risque concurrents. Pour combler cette lacune, ce travail a détaillé la manière de traiter l'hétérogénéité entre les essais par un modèle de régression stratifié pour les risques concurrents et il souligne que les mesures standardes d'hétérogénéité pour évaluer l'incohérence peuvent facilement être utilisées. Les problèmes typiques qui se posent avec les méta-analyses et les avantages dus à la disponibilité des caractéristiques au niveau du patient ont été soulignées. Nous avons proposé une approche landmark pour la fonction d'incidence cumulée afin d'étudier l'impact du temps de suivi sur l'effet du traitement.L'hypothèse d'une taille de grappe non informative était faite dans les deux analyses. On dit que la taille de grappe est informative lorsque la variable réponse dépend de la taille de grappe conditionnellement à un ensemble de variables explicatives. Intuitivement, une méta-analyse répondrait à cette hypothèse. Cependant, la taille de grappe non informative est généralement supposée, même si elle peut être fausse dans certaines situations, ce qui conduit à des résultats incorrects. La taille des grappes informatives (ICS) est un problème difficile et sa présence a un impact sur le choix de la méthodologie. Nous avons discuté plus en détail de l'interprétation des résultats et des quantités qui peuvent être estimées et dans quelles conditions. Nous avons proposé un test pour l'ICS avec des données en grappes censurées. À notre connaissance, il s'agit du premier test sur le contexte de l'analyse de survie. Une étude de simulation a été réalisée pour évaluer la puissance du test et quelques exemples sont fournis à titre d'illustration.L'implémentation de chacun de ces développements est disponible sur https://github.com/AMeddisClustered data often arises in medical research. These are characterized by correlations between observations belonging to the same cluster. Here, we discuss some extension to clustered data in different contexts: evaluating the performance of a candidate biomarker, and assessing the treatment effect in an individual patient data (IPD) meta-analysis with competing risks. The former was motivated by the IMENEO study, an IPD meta-analysis where the prognostic validity of the Circulating Tumor Cells (CTCs) was of interest. Our objective was to determine how well CTCs discriminates patients that died from the one that did not within the t-years, comparing individuals with same tumor stage. Although the covariate-specific time dependent ROC curve has been widely used for biomarker's discrimination, there is no methodology that can handle clusteres censored data. We proposed an estimator for the covariate-specific time dependent ROC curves and area under the ROC curve when clustered failure times are detected. We considered a shared frailty model for modeling the effect of the covariates and the biomarker on the outcome in order to account for the cluster effect. A simulation study was conducted and it showed negligible bias for the proposed estimator and a nonparametric one based on inverse probability censoring weighting, while a semiparametric estimator, ignoring the clustering, is markedly biased.We further considered an IPD meta-analysis with competing risks to assess the benefit of the addition of chemotherapy to radiotherapy on each competing endpoint for patients with nasopharyngeal carcinoma. Recommendations for the analysis of competing risks in the context of randomized clinical trials are well established. Surprisingly, no formal guidelines have been yet proposed to conduct an IPD meta-analysis with competing risk endpoints. To fill this gap, this work detailed: how to handle the heterogeneity between trials via a stratified regression model for competing risks and it highlights that the usual metrics of inconsistency to assess heterogeneity can readily be employed. The typical issues that arise with meta-analyses and the advantages due to the availability of patient-level characteristics were underlined. We proposed a landmark approach for the cumulative incidence function to investigate the impact of follow up on the treatment effect.The assumption of non informative cluster size was made in both the analyses. The cluster size is said to be informative when the outcome depends on the size of the cluster conditional on a set of covariates. Intuitively, a meta-analysis would meet this assumption. However, non informative cluster size is commonly assumed even though it may be not true in some situations and it leads to incorrect results. Informative cluster size (ICS) is a challenging problem and its presence has an impact on the choice of the correct methodology. We discussed more in details interpretation of results and which quantities can be estimated under which conditions. We proposed a test for ICS with censored clustered data. To our knowledge, this is the first test on the context of survival analysis. A simulation study was conducted to assess the power of the test and some illustrative examples were provided.The implementation of each of these developments are available at https://github.com/AMeddis
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Heitz, Richard Philip. "Neural Correlates of Speed-Accuracy Tradeoff: An Electrophysiological Analysis." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14523.
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Recent computational models and physiological studies suggest that simple, two-alternative forced-choice decision making can be conceptualized as the gradual accumulation of sensory evidence. Accordingly, information is sampled over time from a sensory stimulus, giving rise to an activation function. A response is emitted when this function reaches a criterion level of activity. Critically, the phenomenon known as speed-accuracy tradeoff (SAT) is modeled as a shift in the response boundaries (criterion). As speed stress increases and criterion is lowered, the information function travels less distance before reaching threshold. This leads to faster overall responses, but also an increase in error rate, given that less information is accumulated. Psychophysiological data using EEG and single-unit recordings from monkey cortex suggest that these accumulator models are biologically plausible. The present work is an effort to strengthen this position. Specifically, it seeks to demonstrate a neural correlate of criterion and demonstrate its relationship to behavior. To do so, subjects performed a letter discrimination paradigm under three levels of speed stress. At the same time, electroencephalogram (EEG) was used to derive a measure known as the lateralized readiness potential, which is known to reflect ongoing motor preparation in motor cortex. In Experiment 1, the amplitude of the LRP was related to speed stress: as subjects were forced to respond more quickly, less information was accumulated before making a response. In other words, criterion lowered. These data are complicated by Experiment 2, which found that there are boundary conditions for this effect to obtain.
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Heitz, Richard P. "Neural correlates of speed-accuracy tradeoff an electrophysiological analysis /." Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-03282007-110854/.
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Thesis (Ph. D.)--Psychology, Georgia Institute of Technology, 2007.Washburn, David, Committee Member ; Spieler, Dan, Committee Member ; Schumacher, Eric, Committee Member ; Engle, Randall, Committee Chair ; Corballis, Paul, Committee Member.
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Pike, Philip. "Structural correlates of discourse functions in New Testament Greek." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340074.
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Richter, Matthias, Hans-Jörg Starkloff, and Ralf Wunderlich. "Price models with weakly correlated processes." Universitätsbibliothek Chemnitz, 2004. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200401285.
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Empirical autocorrelation functions of returns of stochastic price processes show
phenomena of correlation on small intervals of time, which decay to zero after a
short time. The paper deals with the concept of weakly correlated random processes to describe a mathematical model which takes into account this behaviour of
statistical data. Weakly correlated functions have been applied to model numerous
problems of physics and engineering. The main idea is, that the values of the functions at two points are uncorrelated if the distance between the points exceeds a
certain quantity epsilon > 0. In contrast to the white noise model, for distances smaller
than epsilon a correlation between the values is permitted.
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Tas, Idir. "Traitement d'antenne passif : détection et identification de sources." Grenoble INPG, 1987. http://www.theses.fr/1987INPG0076.
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Le traitement d'antennes reseau sert a detecter et a localiser des sources rayonnantes. Sont presentees,ici, les diverses methodes de traitement d'antennes, basees sur l'information contenue dans la matrice spectrale des signaux recus sur les differents capteurs. Ces methodes sont regroupees en deux categories : solutions globales et solutions decouplees. Experimentation a longue distance en acoustique sousmarine
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Casanova, Sabrina. "Analysis of non-forward quark-quark correlator." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963471694.
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Nuamah, Isaac Frimpong. "Data analytic methods for correlated binary responses." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057846821.
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Andreasson, Martin. "Correlated Failures of Power Systems: Analysis of the Nordic Grid." Thesis, KTH, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-55844.
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The emphasis of this master's thesis is modeling and simulation of failures in large-scale power grids. The linear DC-model governing the active power ows is derived and discussed, and the optimal load shedding problem is introduced. Using Monte Carlo simulations, we have analyzed the eects of correlations between failures of power lines on the total system load shed. Correlations are introduced by a Bernoulli failure model with its rst two ordinary moments given explicitly. The total system load shed is determined by solving the optimal load shedding problem in a MATLAB environment using YALMIP and the GLPK solver. We have introduced a Monte Carlo simulation framework for sampling the statistics of the system load shed as a function of stochastic network parameters, and provide explicit guarantees on the sampling accuracy. This framework has been applied to a 470 bus model of the Nordic power grid. It has been found that increased correlations between Bernoulli failures of power lines can dramatically increase the expected value as well as the variance of the system load shed.
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Junaid, Sara. "An analysis of eating disorder correlates in female varsity athletes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0024/MQ30713.pdf.
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Luo, Jianxia. "Performance analysis with antenna array in correlated nakagami fading channels /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3044799.
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Janke, Elizabeth Amy. "Psychosocial Correlates of Sensitization in Chronic Pain: An Exploratory Analysis." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1108061243.
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Ou, Ju-Chi. "Propensity Score Analysis of Exposure Effects for Spatially Correlated Data." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1263921742.
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Bredenkamp, Brian Victor. "An analysis of correlated curve trend experiments in Eucalyptus grandis." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53915.
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Correlated curve trend (C.C.T.) experiments in Eucalyptus grandis on the Zululand coast of South Africa were analyzed. Growth parameters were described as functions of age using Schnute’s generalized growth function and parameter estimates were described as functions of stand density. Growth attributes were used as moments of a probability density function to describe a diameter distribution model for the species. Time trends in the relationships between growth parameters and stand density were scrutinized with multiple comparisons of paired means. It was shown that diameter growth in lower size classes ceases under conditions of extreme suppression while growth continues unabated in the larger size classes, resulting in greater dispersion in diameter. Competition mortality was to a large extent confined to the lower size classes and severe mortality results in an apparent increase in mean diameter which precludes use of growth functions which impose an asymptote. Allometric growth was investigated on two different sites and growth trends were shown to be anamorphic between sites. This permits a ratio approach to the estimation of growth and yield on one site based on experimental evidence from another. Thinning effects in terms of diameter and height changes were estimated from simulated thinnings using data from unthinned stands while the results of long-term thinning studies were compared in terms of cumulative volume yields. The age at which mean annual increment culminates was determined and a model for the estimation of m.a.i. as a function of age and stand density was constructed. A critical examination of spacing indices revealed that the slopes thereof were much steeper than those for many other species. The better-known indices of Reineke and Yoda were found to be dependent on age.Ph. D.
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Trostel, Brian David 1960. "An analysis of household wealth correlates in a Kalinga village." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277022.
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In the past two decades, ethnoarchaeological methods have grown in importance because of their unique ability to shed direct light on relationships between material culture patterns and social behavior. Ethnoarchaeological research in extant societies allows archaeologists to observe specific examples of how material culture reflects social behavior. The present study demonstrates the value of economic data to ethnoarchaeological analyses. Data collected in 1987-1988 in the Kalinga village of Dangtalan are analyzed from an economic perspective at the household level. Relative household wealth totals are computed for a sample of 56 Dangtalan households. Correlations are explored between wealth and several pottery variables, and between wealth and architectural variables. Results indicate that pottery and architecture in Dangtalan possess certain patterns which correlate in varying degrees with household wealth. Possible implications for archaeology, and potential problems of application are explored.
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Ngamaba, Kayonda. "The correlates of subjective well-being." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/the-correlates-of-subjective-wellbeing(7374410b-78f1-4c7e-993b-1a8092ef07f9).html.
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The motivation for subjective well-being research rather than Gross Domestic Product (GDP) is becoming important to the roles of many governments across the globe and so identifying the strongest correlates of subjective well-being is vital as a starting point to informing policies that support subjective well-being. This thesis investigated the correlates of subjective well-being. Chapter 1 introduced the topic and has been divided into two parts: section 1 explores the motivation for subjective well-being research and section 2 presents the conceptual model of subjective well-being. Chapter 2 gave the rationale for the methodological approaches taken to investigate factors that are associated with subjective well-being. Also, the methods chapter presented limitations of the data used. Chapter 3 explored the determinants of subjective well-being in representative samples of nations; and the results obtained in chapter 3 led to three systematic reviews and meta-analyses (Chapter 4, 5 and 6). Chapter 4 conducted a systematic review and meta-analysis of the association between income inequality and subjective well-being to test the general assumption that people's subjective well-being can be increased by tackling income inequality and investigated inconsistencies of previous studies reporting a negative, positive or no association between income inequality and subjective well-being. Chapter 5 carried out a systematic review and meta-analysis of the association between health status and subjective well-being because the results of the empirical study conducted in chapter 3 suggest that health status is positively associated with subjective well-being. Chapter 6 conducted a systematic review and meta-analysis of the association between financial satisfaction and subjective well-being as the results of the empirical study conducted in chapter 3 suggest that financial satisfaction is positively associated with subjective well-being. Chapter 7 discussed the results, highlighted the need for further studies and policy directions and concluded. Taken altogether these studies suggest that: (1) subjective well-being is important to informing policies that support subjective well-being, (2) they might be circumstances where income inequality may not be associated with people's subjective well-being, (3) health status and financial satisfaction are positively associated with subjective well-being and the magnitude of the association is affected by key operational and methodological factors, (4) life satisfaction might be preferred to happiness as a measure of subjective well-being because it may better captures the influence of health status and financial satisfaction, (5) government policies that support subjective well-being measures should consider using self-reported health status and financial satisfaction amongst factors that are correlated with people's subjective well-being, (6) the association between health status and subjective well-being and the link between financial satisfaction and subjective well-being are medium and further research is required to identify other strongest correlates of subjective well-being.
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Rezazadeh, Arezou. "Error exponent analysis for the multiple access channel with correlated sources." Doctoral thesis, Universitat Pompeu Fabra, 2019. http://hdl.handle.net/10803/667611.
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Due to delay constraints of modern communication systems, studying reliable communication with finite-length codewords is much needed. Error exponents are one approach to study the finite-length regime from the information-theoretic point of view. In this thesis, we study the achievable exponent for single-user communication and also multiple-access channel with both independent and correlated sources. By studying different coding schemes including independent and identically distributed, independent and conditionally distributed, message-dependent, generalized constant-composition and conditional constant-composition ensembles, we derive a number of achievable exponents for both single-user and multi-user communication, and we analyze them.A causa de les restriccions de retard dels sistemes de comunicació moderns, estudiar la fiabilitat de la comunicació amb paraules de codis de longitud finita és important. Els exponents d’error són un mètode per estudiar el règim de longitud finita des del punt de vista de la teoria de la informació. En aquesta tesi, ens centrem en assolir l’exponent per a la comunicació d’un sol usuari i també per l’accés múltiple amb fonts independents i correlacionades. En estudiar els següents esquemes de codificació amb paraules independents i idènticament distribuïdes, independents i condicionalment distribuïdes, depenent del missatge, composició constant generalitzada, i conjunts de composició constant condicional, obtenim i analitzem diversos exponents d’error assolibles tant per a la comunicació d’un sol usuari com per la de múltiples usuaris.
Las restricciones cada vez más fuertes en el retraso de transmisión de los sistemas de comunicación modernos hacen necesario estudiar la fiabilidad de la comunicación con palabras de códigos de longitud finita. Los exponentes de error son un método para estudiar el régimen de longitud finita desde el punto de vista la teoría de la información. En esta tesis, nos centramos en calcular el exponente para la comunicación tanto de un solo usuario como para el acceso múltiple con fuentes independientes y correladas. Estudiando diferentes familias de codificación, como son esquemas independientes e idénticamente distribuidos, independientes y condicionalmente distribuidos, que dependen del mensaje, de composición constante generalizada, y conjuntos de composición constante condicional, obtenemos y analizamos varios exponentes alcanzables tanto para la comunicación de un solo usuario como para la de múltiples usuarios.
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Yung, Hoi-yi Donna, and 容凱怡. "An exploratory analysis investigating correlates of fidgeting among Hong Kong adolescents." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206982.
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Background: As modern nations undergo demographical and epidemiological transitions, infectious diseases are replaced by non-communicable and chronic illnesses as the main source of ill-health. In particular, the obesity epidemic is of important public health concern as the prevalence of overweight and obesity continues to increase at an alarming rate globally. The trend in childhood and adolescent obesity is also escalating rapidly as people are gaining excess weight at younger ages, representing a growing threat as obesity is linked to a myriad of detrimental psychosocial and physical health consequences which may persist through adulthood.
The fundamental cause of obesity is energy imbalance with energy intake exceeding energy expenditure within the human body. Total daily energy expenditures can vary substantially among individuals due to non-exercise activity thermogenesis (NEAT), which accounts for the energy expended from activities we do in daily living, including spontaneous behaviours such as fidgeting. Cumulatively, trivial activities such as fidgeting may accrue to have a significant impact on total daily energy expenditure. Studies have shown that NEAT levels increase or decrease in response to over- and under-feeding, respectively, to counterbalance changes in energy homeostasis. Therefore, fidgeting and NEAT may be an important component in maintaining weight. Decreased levels of fidgeting and NEAT has been hypothesized to be more common among obese individuals as the body fails to activate NEAT in response to over-eating, leading to weight gain.
Understanding the correlates of fidgeting and non-exercise physical activity will be helpful in supplementing the design and implementation of effective strategies against obesity.
Objective: To investigate the correlates of fidgeting among Hong Kong adolescents, including the association between fidgeting and weight status.
Methods: Post hoc statistical analysis was conducted using secondary data from the Hong Kong Student Obesity Surveillance (HKSOS) Project from 2006-2007, which surveyed 34 678 students across 42 secondary schools in Hong Kong. Multivariate logistic regression analyses yielded crude and adjusted odds ratios for the associations of background characteristics, lifestyle characteristics, and dietary intake on fidgeting. Multinomial logistic regression analyses estimated crude and adjusted odds ratios to evaluate the associations between weight status and fidgeting/non-exercise physical activity.
Results: Among the sample of Hong Kong adolescents, subjects who were male, older, born outside of Hong Kong, and had daily consumption of fresh fruits, fresh vegetables, and protein were associated with having lower odds of fidgeting. In contrast, high paternal control, high maternal control, smoking, alcohol consumption, elevated levels of daily screen time, exercise time, non-exercise physical activity time, and increased intake in deep fried/fatty foods, snacks/fizzy drinks, coffee, and tea were all associated with having higher odds of fidgeting.
Fidgeting did not appear to have any significant relationships with weight status. However, non-exercise physical activity was associated with increased odds of being both underweight and overweight.
Conclusions: The results from this study indicate that there are meaningful associations between fidgeting and various correlates, including background demographic characteristics and modifiable behavioural factors. Further studies are required to gain a better understanding of the correlates of fidgeting and their implications to public health.published_or_final_version
Public Health
Master
Master of Public Health
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Stemmle, Christian [Verfasser]. "Analysis of Electron Correlation Effects in Strongly Correlated Systems / Christian Stemmle." Berlin : Freie Universität Berlin, 2019. http://d-nb.info/119886270X/34.
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Nava-Sedeño, Josue Manik, Haralampos Hatzikirou, Rainer Klages, and Andreas Deutsch. "Cellular automaton models for time-correlated random walks: derivation and analysis." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-231568.
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Many diffusion processes in nature and society were found to be anomalous, in the sense of being fundamentally different from conventional Brownian motion. An important example is the migration of biological cells, which exhibits non-trivial temporal decay of velocity autocorrelation functions. This means that the corresponding dynamics is characterized by memory effects that slowly decay in time. Motivated by this we construct non-Markovian lattice-gas cellular automata models for moving agents with memory. For this purpose the reorientation probabilities are derived from velocity autocorrelation functions that are given a priori; in that respect our approach is “data-driven”. Particular examples we consider are velocity correlations that decay exponentially or as power laws, where the latter functions generate anomalous diffusion. The computational efficiency of cellular automata combined with our analytical results paves the way to explore the relevance of memory and anomalous diffusion for the dynamics of interacting cell populations, like confluent cell monolayers and cell clustering.
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Nava-Sedeño, Josue Manik, Haralampos Hatzikirou, Rainer Klages, and Andreas Deutsch. "Cellular automaton models for time-correlated random walks: derivation and analysis." Nature Publishing Group, 2017. https://tud.qucosa.de/id/qucosa%3A30690.
Full textAbstract:
Many diffusion processes in nature and society were found to be anomalous, in the sense of being fundamentally different from conventional Brownian motion. An important example is the migration of biological cells, which exhibits non-trivial temporal decay of velocity autocorrelation functions. This means that the corresponding dynamics is characterized by memory effects that slowly decay in time. Motivated by this we construct non-Markovian lattice-gas cellular automata models for moving agents with memory. For this purpose the reorientation probabilities are derived from velocity autocorrelation functions that are given a priori; in that respect our approach is “data-driven”. Particular examples we consider are velocity correlations that decay exponentially or as power laws, where the latter functions generate anomalous diffusion. The computational efficiency of cellular automata combined with our analytical results paves the way to explore the relevance of memory and anomalous diffusion for the dynamics of interacting cell populations, like confluent cell monolayers and cell clustering.
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Mantegh, Iraj. "Stochastic analysis of multiply-supported piping systems under correlated ground excitations." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/6795.
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Piping systems are among the most important systems in modern industrial facilities, which are also highly affected by events like earthquakes, hurricanes, flood, etc. Like nerves in our body they nurture the industrial plants and hence require protection from these events. For dynamic and specially seismic loading there is no universally accepted design code, hence research is still underway in this area. The response of a system excited by ground motions has two components: (1) pseudo-static which is due to the ground displacement at support points and (2) dynamic which is due to the vibrational excitation. The current methods of estimating that response are typically based on the assumption of a uniform ground motion. Some authors have recently attempted to modify the methods for the spatial variations of ground motion. In this work a different method is presented which also considers the non-uniformity in support excitations. The treatment is based on the random vibration principles and can develop the pseudo-static time history of the system and also the maximum dynamic response at each degree of freedom. For a typical piping system, the correlated ground acceleration and displacement time series are developed at the excited support points. The time series are used to develop the pseudo-static component, and also for the dynamic component by means of a classical step-by-step integration method. Dynamic responses are also developed by the stochastic method and some current methods and are compared, in each case, with the results from the integration method. It is verified that the stochastic results are comparable with the current method results. Comparing the results in case of a uniform and a non-uniform ground motion, it is shown that the cross correlation of support inputs does affect the components of the response significantly and the effect is not predictable. It is also shown that neglecting the non-uniformity in ground motions can lead to an underestimation of results, in some cases, while in some other cases to an overestimation.
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Lewis, Kristin N. "Trajectories of Headache Disability Treatment Response: Psychosocial and Clinical Correlates." Ohio : Ohio University, 2009. http://www.ohiolink.edu/etd/view.cgi?ohiou1266512215.
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Ramamurthy, Senthil. "Localized double-quantum filtered correlated spectroscopy on 3T MRI/MRS scanner." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=4012.
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Thesis (M.S.)--West Virginia University, 2005.Title from document title page. Document formatted into pages; contains ix, 69 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 65-69).
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He, Tao. "MCNP-Based Analysis on Simulating Small Changes in System Responses." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282061590.
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Fang, Jiadong. "Calculating One-sided P-value for TFisher Under Correlated Data." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/1237.
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P-values combination procedure for multiple statistical tests is a common data analysis method in many applications including bioinformatics. However, this procedure is nontrivial when input P-values are dependent. For the Fisher€™s combination procedure, a classic method is the Brown€™s Strategy [1, Brown,1975], which is based empirical moment-matching of gamma distribution. In this project, we address a more general family of weighting-andtruncation p-value combination procedures called TFisher. We first study how to extend Brown€™s Strategy to this problem. Then we make further development in two directions. First, instead of using the empirical polynomial model-fitting strategy to find moments, we developed an analytical calculation strategy based on asymptotic approximation. Second, instead of using the gamma distribution to approximate the null distribution of TFisher, we propose to use a mixed gamma distribution or a shifted-mixed gamma distribution. We focus on calculating the one-sided p-value for TFisher, especially the soft-thresholding version of TFisher. Simulations show that our methods much improve the accuracy than the traditional strategy.
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Wang, Shanshan. "Modeling and Performance Evaluation of Spatially-correlated Cellular Networks." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS079.
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Dans la modélisation et l'évaluation des performances de la communication cellulaire sans fil, la géométrie stochastique est largement appliquée afin de fournir des solutions plus efficaces et plus précises. Le processus ponctuel de Poisson homogène (H-PPP), est le processus ponctuel le plus largement utilisé pour modéliser les emplacements spatiaux des stations de base (BS) en raison de sa facilité de traitement mathématique et de sa simplicité. Pour les fortes corrélations spatiales entre les emplacements des stations de base, seuls les processus ponctuels (PP) avec inhibitions et attractions spatiales peuvent être utiles. Cependant, le temps de simulation long et la faible aptitude mathématique rendent les PP non-Poisson non adaptés à l'évaluation des performances au niveau du système. Par conséquent, pour surmonter les problèmes mentionnés, nous avons les contributions suivantes dans cette thèse: Premièrement, nous introduisons une nouvelle méthodologie de modélisation et d’analyse de réseaux cellulaires de liaison descendante, dans laquelle les stations de base constituent un processus ponctuel invariant par le mouvement qui présente un certain degré d’interaction entre les points. L'approche proposée est basée sur la théorie des PP inhomogènes de Poisson (I-PPP) et est appelée approche à double amincissement non homogène (IDT). L’approche proposée consiste à approximer le PP initial invariant par le mouvement avec un PP équivalent constitué de la superposition de deux I-PPP conditionnellement indépendants. Les inhomogénéités des deux PP sont créées du point de vue de l'utilisateur type ``centré sur l'utilisateur''. Des conditions suffisantes sur les paramètres des fonctions d'amincissement qui garantissent une couverture meilleure ou pire par rapport au modèle de PPP homogène de base sont identifiées. La précision de l'approche IDT est justifiée à l'aide de données empiriques sur la distribution spatiale des stations de base. Ensuite, sur la base de l’approche IDT, une nouvelle expression analytique traitable du rapport de brouillage moyen sur signal (MISR) des réseaux cellulaires où les stations de base présentent des corrélations spatiales est introduite. Pour les PP non-Poisson, nous appliquons l'approche IDT proposée pour estimer les performances des PP non-Poisson. En prenant comme exemple le processus de points β-Ginibre ( β -GPP), nous proposons de nouvelles fonctions d’approximation pour les paramètres clés dans l’approche IDT afin de modéliser différents degrés d’inhibition spatiale et de prouver que MISR est constant en densification de réseau. Nous prouvons que la performance MISR dans le cas β-GPP ne dépend que du degré de répulsion spatiale, c'est-à-dire β , quelles que soient les densités de BS. Les nouvelles fonctions d'approximation et les tendances sont validées par des simulations numériques.Troisièmement nous étudions plus avant la méta-distribution du SIR à l’aide de l’approche IDT. La méta-distribution est la distribution de la probabilité de réussite conditionnelle compte tenu du processus de points. Nous dérivons et comparons l'expression sous forme fermée pour le b-ème moment dans les cas PP H-PPP et non-Poisson. Le calcul direct de la fonction de distribution cumulative complémentaire (CCDF) pour la méta-distribution n'étant pas disponible, nous proposons une méthode numérique simple et précise basée sur l'inversion numérique des transformées de Laplace. L'approche proposée est plus efficace et stable que l'approche conventionnelle utilisant le théorème de Gil-Pelaez. La valeur asymptotique de la CCDF de la méta distribution est calculée dans la nouvelle définition de la probabilité de réussite. En outre, la méthode proposée est comparée à certaines autres approximations et limites, par exemple l’approximation bêta, les bornes de Markov et les liaisons de Paley-Zygmund. Cependant, les autres modèles et limites d'approximation sont comparés pour être moins précis que notre méthode proposéeIn the modeling and performance evaluation of wireless cellular communication, stochastic geometry is widely applied, in order to provide more efficient and accurate solutions. Homogeneous Poisson point process (H-PPP) with identically independently distributed variables, is the most widely used point process to model the spatial locations of base stations (BSs) due to its mathematical tractability and simplicity. For strong spatial correlations between locations of BSs, only point processes (PPs) with spatial inhibitions and attractions can help. However, the long simulation time and weak mathematical tractability make non-Poisson PPs not suitable for system level performance evaluation. Therefore, to overcome mentioned problems, we have the following contributions in this thesis: First, we introduce a new methodology for modeling and analyzing downlink cellular networks, where the base stations constitute a motion-invariant point process that exhibits some degree of interactions among the points. The proposed approach is based on the theory of inhomogeneous Poisson PPs (I-PPPs) and is referred to as inhomogeneous double thinning (IDT) approach. The proposed approach consists of approximating the original motion-invariant PP with an equivalent PP that is made of the superposition of two conditionally independent I-PPPs. The inhomogeneities of both PPs are created from the point of view of the typical user. The inhomogeneities are mathematically modeled through two distance-dependent thinning functions and a tractable expression of the coverage probability is obtained. Sufficient conditions on the parameters of the thinning functions that guarantee better or worse coverage compared with the baseline homogeneous PPP model are identified. The accuracy of the IDT approach is substantiated with the aid of empirical data for the spatial distribution of the BSs. Then, based on the IDT approach, a new tractable analytical expression of mean interference to signal ratio (MISR) of cellular networks where BSs exhibits spatial correlations is introduced.For non-Poisson PPs, we apply proposed IDT approach to approximate the performance of non-Poisson PPs. Taking β-Ginibre point process (β -GPP) as an example, we propose new approximation functions for key parameters in IDT approach to model different degree of spatial inhibition and we successfully prove that MISR for β -GPP is constant under network densification with our proposed approximation functions. We prove that of MISR performance under β-GPP case only depends on the degree of spatial repulsion, i.e., β , regardless of different BS densities. We also prove that with the increase of β or (given fixed γ or β respectively), the corresponding MISR for β-GPP decreases. The new approximation functions and the trends are validated by numerical simulations. Third, we further study meta distribution of the SIR with the help of the IDT approach. Meta distribution is the distribution of the conditional success probability given the point process. We derive and compare the closed-form expression for the b-th moment under H-PPP and non-Poisson PP case. Since the direct computation of the complementary cumulative distribution function (CCDF) for meta distribution is not available, we propose a simple and accurate numerical method based on numerical inversion of Laplace transforms. The proposed approach is more efficient and stable than the conventional approach using Gil-Pelaez theorem. The asymptotic value of CCDF of meta distribution is computed under new definition of success probability. Furthermore, the proposed method is compared with some other approximations and bounds, e.g., beta approximation, Markov bounds and Paley-Zygmund bound. However, the other approximation models and bounds are compared to be less accurate than our proposed method
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Garikiparthi, Chaitanya N. Liefvoort Appie van de. "Sample path analysis of stochastic processes busy periods of auto-correlated single server queues /." Diss., UMK access, 2008.
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Thesis (Ph. D.)--School of Computing and Engineering. University of Missouri--Kansas City, 2008."A dissertation in computing networking and telecommunications networking." Advisor: Appie van de Liefvoort. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Feb. 6, 2009. Includes bibliographical references (leaves 85-89). Online version of the print edition.
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Oliveira, Jovana Mauricio Acosta de. "Análise funcional das construções correlatas alternativas." Niterói, 2017. https://app.uff.br/riuff/handle/1/3419.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Este trabalho tem como objetivo observar os padrões de uso das construções correlatas alternativas à luz da Linguística Funcional Centrada no Uso, reunindo tanto pressupostos funcionalistas quanto construcionistas. Essa teoria parte do princípio de que a língua emerge a partir de seu uso e vai sendo moldada por meio de sua própria instabilidade. A partir dessa premissa, nossa pesquisa observa os usos e os contextos em que estão inseridas as construções correlatas alternativas. Pretendemos analisar o comportamento semântico e sintático que envolve esse tipo de construção dentro do quadro da correlação. Pretendemos, ainda, observar os valores sintáticos e semânticos de cada type correlativo encontrado. Com base na constatação de Fillenbaum (1986) de que algumas orações disjuntivas podem assumir um valor condicional, observamos se há sobreposição de valores semânticos nas construções correlatas alternativas analisadas e quais os fatores motivadores para esse fenômeno. O objeto em análise é tratado como construção, por aderirmos à proposta atual da Gramática de Construções nos modelos de Croft (2007), Goldberg e Jackendoff (2004) e Trousdale (2008). Nessa perspectiva, a gramática é vista de forma holística, ou seja, nenhum nível é central. Ademais, forma e significado são pareados como iguais e passam a funcionar, nesta teoria, como unidades básicas e centrais da língua, operando em diferentes níveis da gramática. O corpus utilizado é composto por textos retirados de versões eletrônicas da Revista Veja (http://www.veja.abril.com.br)
This study aims to observe the usage patterns of the alternatives related buildings in the light of Linguistics Centered Functional in use, bringing together both functionalist assumptions as constructionist. This theory assumes that language emerges from its use and is being shaped by its instability. From this premise, our research will observe the uses and contexts in which they operate alternative constructions. We intend to analyze the semantic and syntactic behavior involving this type of construction within the correlation table. It is intended to also observe the syntactic and semantic value of each correlative type found. Based on the finding Fillenbaum (1986) that some disjunctive prayers can take a conditional value, we will see if there is overlap of semantic values in the alternatives considered related buildings and what the motivating factors for this phenomenon. The object in question will be treated as construction, by adhering to the current proposal of construction of grammar in Croft models (2007), Goldberg and Jackendoff (2004) and Trousdale (2008). From this perspective, the grammar is viewed holistically, that is, no level is central. Moreover, form and meaning are paired as equals and will function in this theory, as basic units and language centers, operating at different levels of grammar. The corpus used is composed of texts taken from electronic versions of the magazine Veja (http://www.veja.abril.com.br)
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Chan, Ho Ka. "Impact of synaptic properties, background activities and conductance effects on neural computation of correlated inputs." HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/176.
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Neurons transmit information through spikes in neural network through synaptic couplings. Given the prevalence of correlation among neural spike trains experimentally observed in different brain areas, it is of interest to study how neurons compute correlated input. Yet how it depends on the synaptic properties and conductance kinetics in neuronal interaction is very little known. Through simulation of leaky integrate-and-fire (LIF) neurons, we have studied the effects of excitatory and inhibitory synaptic decay times, level of background activities and higher-order conductance effects on the output correlation of different time scales for neurons receiving correlated excitatory input, and provided important understanding on the mechanism of how these factors influence neural computation of such correlated input. We showed that when the conductance effects are totally ignored, increasing excitatory synaptic decay time jitters output spike time and shapes the output correlation of short to medium time scale, while the output correlation of very long time scale is determined by the membrane time constant. When conductance effects are considered, this is no longer the case as the effective membrane time constant becomes comparable to the excitatory decay time. We found that the ratio of long-term correlation to short-term correlation (synchrony) increases with excitatory synaptic decay time and decreases with the level of input activities due to the combined effects of jittered spike time, which can be predicted from the time window and magnitude of the effects of a single input spike on membrane potential, and burst firing. In particular, it is possible for neurons with small excitatory synaptic decay time in high conductance state to respond to correlated input by solely giving extra precisely timed synchronous spikes without exhibiting correlation of longer time scale. In addition, we found that inhibitory synaptic decay time shapes correlation by controlling the relative contribution of excitatory and inhibitory input to output firing. As a result, both output correlation and synchrony increase with it. These results are qualitatively true for a wide range of input correlation and synaptic efficacies. Finally, we showed that fluctuations of conductance and membrane potential reduce output correlation, which can be explained by the reduced prevalence of burst firing. These results suggest that spike initiation dynamics of neurons can be well characterized by their synaptic decay times and the level of input activities. These properties are therefore expected to influence neurons’ ability to code temporal information. These results also hint that correlation, in particular that of long time scale, would be lower if more realistic biophysical features like neural adaptations and network circuitry with feed-forward or recurrent inhibition are considered. It suggests that studies using single LIF neurons tend to overestimate output correlation and underestimate the ability of neurons in producing precisely timed output.
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Covington, Michele. "CORRELATES AND CAUSES OF VIOLENCE AGAINST POLICE OFFICERS: A CRIMINAL EVENTS ANALYSIS." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2766.
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Violence against police officers is a major problem in America. Previous studies on violence and police officers have usually focused on violence by police officers, not violence against police officers. This study is the first of its kind as it examines violence against police officers from a comprehensive, criminal events perspective with detailed use of force/officer violence data collected by the Orlando Police Department. Individual officer characteristics, individual offender characteristics, situational variables, and geographical factors are considered. Logistic regression results indicate that use of force incidents are more likely to involve battery against one or more police officers when multiple officers are involved, when offenders are female, when offenders are of larger size (measured by weight), and when offenders are known to have recently consumed alcohol before the incident. Spatial analysis results indicate that there is significant clustering of batteries against police officers within the City of Orlando, and that the areas where police battery is predominant are very similar to areas where alcohol-related businesses are prevalent, and theoretically, more alcohol is consumed. Policy implications and directions for future research are discussed.Ph.D.
Department of Sociology
Sciences
Sociology PhD
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Meloro, Phyllis C. "Do high school advisory programs promote personalization? : correlates of school belonging /." View online ; access limited to URI, 2005. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3188841.
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