Log in

Relevant bibliographies by topics / Biased estimates / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Biased estimates.

Dissertations / Theses on the topic 'Biased estimates'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Biased estimates.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Hanley, Neil T. "Biased estimates in depressive realism : effects of mood, motivation, valence, response frequency and outcome density." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100616.

Full text

Abstract:

Several past studies have identified that dysphoric undergraduates (those with depressed mood) sometimes give estimates of their control over outcomes closer to the actual contingency than estimates made by the nondepressed. This "depressive realism" phenomenon is typically found in tasks with zero control and frequent outcomes. The present paper investigates this phenomenon with a more powerful design for comparing estimates. Experiment 1 manipulated motivation for accuracy to compare the prevalent self-serving motivational bias explanation to an information processing bias perspective. Depre

APA, Harvard, Vancouver, ISO, and other styles

2

Araújo, Cristina da Paixão. "Uso de informação secundária imprecisa e inacurada no planejamento de curto prazo." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/127891.

Full text

Abstract:

No setor de mineração, a amostragem está presente no empreendimento mineral desde a fase da exploração até a lavra. Para diminuir a incerteza na previsão de teores, o planejamento de lavra requer adensamento da amostragem para garantir previsões acuradas e precisas. Acredita-se, que quanto maior a quantidade de amostras, maior a confiabilidade nas estimativa de teores. Na fase exploração, geralmente, a amostragem é realizada por furos de sondagem com coroas diamantadas, que é uma técnica com alto custo de execução e produz amostras com acuracidade e precisão. Nesta fase, existem poucos dados c

APA, Harvard, Vancouver, ISO, and other styles

3

Sereevinyayut, Piya. "On estimate aggregation : studies of how decision makers aggregate quantitative estimates in three different cases." Doctoral thesis, Universitat Pompeu Fabra, 2013. http://hdl.handle.net/10803/125062.

Full text

Abstract:

This dissertation examines how people aggregate quantitative advices to reach their own estimates. Each chapter explores a different situation that could affect how advices are evaluated, and consequentially how advices will be combined. The first chapter demonstrates that people measure advices' extremity degrees by anhoring upon the advice set's median. It also shows that, unlike multiplicative scaling, additive scaling of advices affects how outliers are perceived. The second chapter deals with advices that are obtained serially. The results reveals that whether people execute the aggregati

APA, Harvard, Vancouver, ISO, and other styles

4

Долгіх, Володимир Миколайович, Владимир Николаевич Долгих, Volodymyr Mykolaiovych Dolhikh, Яна Володимирівна Долгіх, Яна Владимировна Долгих та Yana Volodymyrivna Dolhikh. "Оценка параметров производственной функции Кобба-Дугласа нелинейным методом наименьших квадратов". Thesis, Украинская академия банковского дела Национального банка Украины, 2008. http://essuir.sumdu.edu.ua/handle/123456789/62471.

Full text

Abstract:

Параметры функции Koббa-Дугласа, найденные методом наименьших квадратов после логарифмического преобразования, смещены. Методы нелинейного программирования могут быть использованы для того, чтобы определять несмещенные параметры.<br>Parameters of the Kobb-Douglas function, which are finded by the method of least squares after logarithmic transformation, are biased. The methods of nonlinear programming may be used in order to define the unbiased parameters.

APA, Harvard, Vancouver, ISO, and other styles

5

Millet, Floyd W. "Improving Electromagnetic Bias Estimates." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd525.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Lee, Wonwoo. "Fractional principal components regression: a general approach to biased estimators." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/49819.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Wissel, Julia. "A new biased estimator for multivariate regression models with highly collinear variables." Doctoral thesis, kostenfrei, 2009. http://www.opus-bayern.de/uni-wuerzburg/volltexte/2009/3638/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Rollins, Derrick K. "Unbiased estimates of measured process variables when measurement biases and process leaks are present /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu148768624382009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Durazo-Arvizu, Ramon Angel. "Bias-adjusted estimates of survival following group sequential hypothesis testing." Diss., The University of Arizona, 1994. http://hdl.handle.net/10150/186830.

Full text

Abstract:

It is known that repeated use of fixed sample hypothesis testing causes inflation of the type one statistical error. Since in a group sequential design a study is stopped preferentially when extreme data have been observed, we expect that the usual estimators are biased toward the extremes. We demonstrate through simulations that the fixed sample survival estimators are biased if computed after stopping a group sequential trial in which stopping is based on survival statistics. The problem is first studied under no censored data and then with the more realistic setting of censoring. In particu

APA, Harvard, Vancouver, ISO, and other styles

10

Sogunro, Babatunde Oluwasegun. "Nonresponse in industrial censuses in developing countries : some proposals for the correction of biased estimators." Thesis, University of Hull, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278593.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Thomson, Adrian Wilfred. "An estimator to reduce mail survey nonresponse bias in estimates of recreational catch: a case study using data from the Panulirus cygnus fishery of Western Australia." Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/831.

Full text

Abstract:

Accurate recreational catch estimates are important in fisheries management. The mail survey is an easy and low cost method for collecting data for making these estimates. Unfortunately, this survey method results in estimates that can be seriously affected by nonresponse bias. This research develops estimators that reduce this bias and demonstrates their effectiveness using the recreational western rock lobster fishery as a case study.

APA, Harvard, Vancouver, ISO, and other styles

12

Donaldson, Lachlan Hugh. "An estimate of analytical bias in meta-analysis." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18671.

Full text

Abstract:

Objective: To systematically assess the benefits and harms of intravenous thrombolysis for patients with acute ischaemic stroke and to use this analysis to explore the influence of analytical bias on meta-analysis outcomes. Methods: After first cataloguing published concerns regarding the evidence supporting the use of intravenous thrombolysis in stroke, we conducted a systematic review and meta-analysis of randomised clinical studies of intravenous thrombolysis compared with control in patients with presumed acute ischaemic stroke. Analyses were then repeated with various limitations in orde

APA, Harvard, Vancouver, ISO, and other styles

13

Remund, Todd Gordon. "A Naive, Robust and Stable State Estimate." BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/1424.

Full text

Abstract:

A naive approach to filtering for feedback control of dynamic systems that is robust and stable is proposed. Simulations are run on the filters presented to investigate the robustness properties of each filter. Each simulation with the comparison of the filters is carried out using the usual mean squared error. The filters to be included are the classic Kalman filter, Krein space Kalman, two adjustments to the Krein filter with input modeling and a second uncertainty parameter, a newly developed filter called the Naive filter, bias corrected Naive, exponentially weighted moving average (EWMA)

APA, Harvard, Vancouver, ISO, and other styles

14

Rasso, Jason. "Psychological Distance: The Relation Between Construals, Mindsets, and Professional Skepticism." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4565.

Full text

Abstract:

In this study, I examine the influence of construals (interpretations) and mindsets on professional skepticism in auditors. Auditors have been criticized lately for not displaying enough professional skepticism, particularly in their audits of complex estimates (PCAOB 2008). Regulators speculate about and academic research shows a correlation between low professional skepticism and both audit failures and audit malpractice claims (Beasley et al. 2001; Anderson and Wolfe 2002). I hypothesize that prolonging the deliberative mindset in the audit judgment and decision-making process can increa

APA, Harvard, Vancouver, ISO, and other styles

15

Ahrends, Antje. "Do we know enough? : the impacts of data biases, insufficient sampling and degradation on biodiversity estimates in Tanzanian forests : implications for conservation planning." Thesis, University of York, 2010. http://etheses.whiterose.ac.uk/992/.

Full text

Abstract:

In the face of continued loss of biodiversity and limited conservation resources, conservation needs to be as efficient as possible. This relies on an unbiased knowledge of the distribution of biodiversity and the threats to it. While we cannot afford to delay conservation action until better data are available, it is essential to understand the limitations of and mitigate biases in the data that we base critical conservation decisions on. This thesis analyses the implications of data biases, insufficient data and degradation and formulates recommendations for conservation planning. While it f

APA, Harvard, Vancouver, ISO, and other styles

16

Keyser, John D. III. "The Effects of Preparer Familiarity and Preparer Affect on Reviewer Decisions." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1489679599785707.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Armstrong, Paul Walter. "Fact or fiction : the problem of bias in Government Statistical Service estimates of patient waiting times." Thesis, London School of Hygiene and Tropical Medicine (University of London), 2000. http://researchonline.lshtm.ac.uk/682277/.

Full text

Abstract:

The cumulative likelihood of admission estimated for any given 'time-since-enrolment' depends on how we define membership of the population 'at-risk' and on how we handle right and left censored waiting times. As a result, published statistics will be biased because they assume that the waiting list is both stationary and closed and exclude all those not yet or never to be admitted. The cumulative likelihood of admission within three months was estimated using the Government Statistical Service method and compared with estimates which relaxed the assumption of stationarity and reflected variat

APA, Harvard, Vancouver, ISO, and other styles

18

SHRESTHA, Mandira Singh. "Bias-Adjustment of Satellite-Based Rainfall Estimates over the Central Himalayas of Nepal for Flood Prediction." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142254.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Xie, Diqiong. "Bias and variance of treatment effect estimators using propensity-score matching." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/4980.

Full text

Abstract:

Observational studies are an indispensable complement to randomized clinical trials (RCT) for comparison of treatment effectiveness. Often RCTs cannot be carried out due to the costs of the trial, ethical questions and rarity of the outcome. When noncompliance and missing data are prevalent, RCTs become more like observational studies. The main problem is to adjust for the selection bias in the observational study. One increasingly used method is propensity-score matching. Compared to traditional multi-covariate matching methods, matching on the propensity score alleviates the curse of dimensi

APA, Harvard, Vancouver, ISO, and other styles

20

Mehrotra, Sumit. "Enhancement and bias compensation in extended kalman observer as a parameter estimator." Cincinnati, Ohio : University of Cincinnati, 2001. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=ucin990726300.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Wei, Xing. "Comparisons of Estimators of Small Proportion under Group Testing." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2195.

Full text

Abstract:

Binomial group testing has been long recognized as an efficient method of estimating proportion of subjects with a specific characteristic. The method is superior to the classic maximum likelihood estimator (MLE), particularly when the proportion is small. Under the group testing model, we assume the testing is conducted without error. In the present research, a new Bayes estimator will be proposed that utilizes an additional piece of information, the proportion to be estimated is small and within a given range. It is observed that with the appropriate choice of the hyper-parameter our new Bay

APA, Harvard, Vancouver, ISO, and other styles

22

Montague, Norma R. "The Effects of Directional Audit Guidance and Estimation Uncertainty on Auditor Confirmation Bias and Professional Skepticism When Evaluating Fair Value Estimates." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3539.

Full text

Abstract:

In this study, I examine the effects of audit guidance and estimation uncertainty on auditors’ confirmation bias and professional skepticism when evaluating fair value estimates. Fair value estimation is becoming more prevalent in financial reporting frameworks, and regulators warn that fair value estimation presents higher risk of material misstatement when greater judgment in estimation is involved. In addition recent evidence from the Public Company Accounting Oversight Board (PCAOB) indicates that some auditors may not be exercising sufficient professional skepticism when performing audit

APA, Harvard, Vancouver, ISO, and other styles

23

MEHROTRA, SUMIT. "ENHANCEMENT AND BIAS COMPENSATION IN THE EXTENDED KALMAN OBSERVER AS A PARAMETER ESTIMATOR." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990726300.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Thompson, Jeffrey A. "Generic Drug Discount Programs, Cash-Only Drug Exposure Misclassification Bias, and the Implications for Claims-Based Adherence Measure Estimates." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1521191260356822.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Pressler, Taylor R. "The Use of Propensity Scores to Estimate Sample Selection Error in Observational Data." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1298997078.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Perez, Federico Sucunza. "Fatores que afetam a detectabilidade da toninha (Pontoporia blainvillei) em estudos de estimativas populacionais." Universidade Federal de Juiz de Fora, 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/2220.

Full text

Abstract:

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-07-26T12:08:42Z No. of bitstreams: 1 federicosucunzaperez.pdf: 1575469 bytes, checksum: cd3afde7a6b38a3953480ca345febe79 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-07-27T11:27:42Z (GMT) No. of bitstreams: 1 federicosucunzaperez.pdf: 1575469 bytes, checksum: cd3afde7a6b38a3953480ca345febe79 (MD5)<br>Made available in DSpace on 2016-07-27T11:27:42Z (GMT). No. of bitstreams: 1 federicosucunzaperez.pdf: 1575469 bytes, checksum: cd3afde7a6b38a3953480ca345febe79 (MD5) Previous is

APA, Harvard, Vancouver, ISO, and other styles

27

Lane, Forrest C. "The Use Of Effect Size Estimates To Evaluate Covariate Selection, Group Separation, And Sensitivity To Hidden Bias In Propensity Score Matching." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc103349/.

Full text

Abstract:

Covariate quality has been primarily theory driven in propensity score matching with a general adversity to the interpretation of group prediction. However, effect sizes are well supported in the literature and may help to inform the method. Specifically, I index can be used as a measure of effect size in logistic regression to evaluate group prediction. As such, simulation was used to create 35 conditions of I, initial bias and sample size to examine statistical differences in (a) post-matching bias reduction and (b) treatment effect sensitivity. The results of this study suggest these cond

APA, Harvard, Vancouver, ISO, and other styles

28

Lincoln, James. "The Generalized Empirical Likelihood estimator with grouped data : bias correction in Linked Employer-Employee models." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/the-generalized-empirical-likelihood-estimator-with-grouped-data--bias-correction-in-linked-employeremployee-models(5b100c37-0093-472b-95ad-aee519d1efd4).html.

Full text

Abstract:

This thesis is comprised of two parts: Part I It is common in empirical economic applications that use micro-data to exhibit a natural ordering into groups. Angrist (1991) use dummy variables based on such grouping to form instruments for consistent estimation. Khatoon et al. (2014) and Andrews et al. (2016) extend the GEL class of estimators to the case where moment conditions are specified on a group-by-group basis and refer to the resulting estimator as group-GEL. A natural consequence of basing instruments or moment conditions on groups is the degree of over-identification can increase sig

APA, Harvard, Vancouver, ISO, and other styles

29

Ward, Robert Dean. "The role of selection bias in estimates of the deterrence effect of drug testing : evidence from the national longitudinal survey of youth." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA361980.

Full text

Abstract:

Thesis (M.S. in Management) Naval Postgraduate School, March 1999.<br>"March 1999". Thesis advisor(s): Stephen L. Mehay, Rosalie L. Pacula. Includes bibliographical references (p. 81-82). Also available online.

APA, Harvard, Vancouver, ISO, and other styles

30

Bertke, Stephen J. "A Simulation Study of the Cox Proportional Hazards Model and the Nested Case-Control Study Design." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307321495.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Lindberg, Mattias, and Peter Guban. "Auxiliary variables a weight against nonresponse bias : A simulation study." Thesis, Stockholms universitet, Statistiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-142977.

Full text

Abstract:

Today’s surveys face a growing problem with increasing nonresponse. The increase in nonresponse rate causes a need for better and more effective ways to reduce the nonresponse bias. There are three major scientific orientation of today’s research dealing with nonresponse. One is examining the social factors, the second one studies different data collection methods and the third investigating the use of weights to adjust estimators for nonresponse. We would like to contribute to the third orientation by evaluating estimators which use and adjust weights based on auxiliary variables to balanc

APA, Harvard, Vancouver, ISO, and other styles

32

Campbell, Alan D. "An Analysis of Smoothing of Proved Oil and Gas Reserve Quantities and an Analysis of Bias and Variability in Revisions of Previous Estimates of Proved Oil and Gas Reserve Quantities." Thesis, University of North Texas, 1988. https://digital.library.unt.edu/ark:/67531/metadc331283/.

Full text

Abstract:

The purpose of this study is to determine whether oil and gas producing companies smooth their ending reserve quantities. Smoothing is defined as a reduction in variance in the trend of ending reserve quantities over time compared to the trend of ending reserve quantities less the hypothesized smoothing variable over time. This study focuses on two variables that are most susceptible to manipulation—revisions of previous estimates and additions. This study also examines whether revisions are positively or negatively biased and the variability of the revisions. The sample consists of 70 compani

APA, Harvard, Vancouver, ISO, and other styles

33

Azad, Abul K. "Robust Speech Filter And Voice Encoder Parameter Estimation using the Phase-Phase Correlator." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/97221.

Full text

Abstract:

In recent years, linear prediction voice encoders have become very efficient in terms of computing execution time and channel bandwidth usage while providing, in the absence of im- pulsive noise, natural sounding synthetic speech signals. This good performance has been achieved via the use of a maximum likelihood parameter estimation of an auto-regressive model of order ten that best fits the speech signal under the assumption that the signal and the noise are Gaussian stochastic processes. However, this method breaks down in the presence of impulse noise, which is common in practice, resultin

APA, Harvard, Vancouver, ISO, and other styles

34

Hemann, Joshua G. "Assessing Positive Matrix Factorization model fit: A new method to estimate uncertainty and bias in factor contributions at the daily time scale." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1447682.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Cook, Mylan Ray. "Using Coherence to Improve the Calculation of Active Acoustic Intensity with the Phase and Amplitude Gradient Estimator Method." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8834.

Full text

Abstract:

Coherence, which gives the similarity of signals received at two microphone locations, can be a powerful tool for calculating acoustic quantities, particularly active acoustic intensity. To calculate active acoustic intensity, a multi-microphone probe is often used, and therefore coherence between all microphone pairs on the probe can be obtained. The phase and amplitude gradient estimator (PAGE) method can be used to calculate intensity, and is well suited for many situations. There are limitations to this method—such as multiple sources or contaminating noise in the sound field—which can cau

APA, Harvard, Vancouver, ISO, and other styles

36

da, Glória Abage de Lima Maria. "Essays on heteroskedasticity." Universidade Federal de Pernambuco, 2008. https://repositorio.ufpe.br/handle/123456789/7140.

Full text

Abstract:

Made available in DSpace on 2014-06-12T18:29:15Z (GMT). No. of bitstreams: 2 arquivo4279_1.pdf: 1161561 bytes, checksum: 80aee0b17f88de11dd7d0999ad1594a1 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2008<br>Esta tese de doutorado trata da realização de inferências no modelo de regressão linear sob heteroscedasticidade de forma desconhecida. No primeiro capítulo, nós desenvolvemos estimadores intervalares que são robustos à presença de heteroscedasticidade. Esses estimadores são baseados em estimadores consistentes de matrizes de cova

APA, Harvard, Vancouver, ISO, and other styles

37

Hur, Jungshik. "Two Essays on Asset Pricing." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27458.

Full text

Abstract:

This dissertation consists of two chapters. The first chapter shows that the measurement errors in betas for stocks induce corresponding measurement errors in alphas and a spurious negative covariance between the estimated betas and alphas across stocks. This negative covariance between the estimated betas and alphas results in a violation of the independence assumption between the independent variable (betas) and error terms in the Fama-MacBeth regressions of tests of the CAPM, thereby creating a downward bias in the estimated market risk premiums. The procedure of using portfolio returns and

APA, Harvard, Vancouver, ISO, and other styles

38

Hall, Benjamin. "NONPARAMETRIC ESTIMATION OF DERIVATIVES WITH APPLICATIONS." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_diss/114.

Full text

Abstract:

We review several nonparametric regression techniques and discuss their various strengths and weaknesses with an emphasis on derivative estimation and confidence band creation. We develop a generalized C(p) criterion for tuning parameter selection when interest lies in estimating one or more derivatives and the estimator is both linear in the observed responses and self-consistent. We propose a method for constructing simultaneous confidence bands for the mean response and one or more derivatives, where simultaneous now refers both to values of the covariate and to all derivatives under consid

APA, Harvard, Vancouver, ISO, and other styles

39

Tran, Van-Tinh. "Selection Bias Correction in Supervised Learning with Importance Weight." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1118/document.

Full text

Abstract:

Dans la théorie de l'apprentissage supervisé, l'hypothèse selon laquelle l'échantillon de d'apprentissage et de test proviennent de la même distribution de probabilité, joue un rôle crucial. Malheureusement, cette hypothèse essentielle est souvent violée en présence d'un biais de sélection. Dans ce contexte, les algorithmes d'apprentissage supervisés standards peuvent souffrir d'un biais significatif. Dans cette thèse, nous abordons le problème du biais de sélection en apprentissage supervisé en utilisant la méthode de pondération de l'importance ("importance weighting" en anglais).Dans un pre

APA, Harvard, Vancouver, ISO, and other styles

40

He, Jun. "THE APPLICATION OF LAST OBSERVATION CARRIED FORWARD (LOCF) IN THE PERSISTENT BINARY CASE." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3621.

Full text

Abstract:

The main purpose of this research was to evaluate use of Last Observation Carried Forward (LOCF) as an imputation method when persistent binary outcomes are missing in a Randomized Controlled Trial. A simulation study was performed to see the effect of dropout rate and type of dropout (random or associated with treatment arm) on Type I error and power. Properties of estimated event rates, treatment effect, and bias were also assessed. LOCF was also compared to two versions of complete case analysis - Complete1 (excluding all observations with missing data), and Complete2 (only carrying forw

APA, Harvard, Vancouver, ISO, and other styles

41

Naftali, Eran 1971. "First order bias and second order variance of the Maximum Likelihood Estimator with application to multivariate Gaussian data and time delay and Doppler shift estimation." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88334.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Price, Sarah Jane. "What are we missing by ignoring text records in the Clinical Practice Research Datalink? : using three symptoms of cancer as examples to estimate the extent of data in text format that is hidden to research." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/21692.

Full text

Abstract:

Electronic medical record databases (e.g. the Clinical Practice Research Datalink, CPRD) are increasingly used in epidemiological research. The CPRD has two formats of data: coded, which is the sole format used in almost all research; and free-text (or ‘hidden’), which may contain much clinical information but is generally unavailable to researchers. This thesis examines the ramifications of omitting free-text records from research. Cases with bladder (n=4,915) or pancreatic (n=3,635) cancer were matched to controls (n=21,718, bladder; n=16,459, pancreas) on age, sex and GP practice. Coded and

APA, Harvard, Vancouver, ISO, and other styles

43

De, Moliner Anne. "Estimation robuste de courbes de consommmation électrique moyennes par sondage pour de petits domaines en présence de valeurs manquantes." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK021/document.

Full text

Abstract:

Dans cette thèse, nous nous intéressons à l'estimation robuste de courbes moyennes ou totales de consommation électrique par sondage en population finie, pour l'ensemble de la population ainsi que pour des petites sous-populations, en présence ou non de courbes partiellement inobservées.En effet, de nombreuses études réalisées dans le groupe EDF, que ce soit dans une optique commerciale ou de gestion du réseau de distribution par Enedis, se basent sur l'analyse de courbes de consommation électrique moyennes ou totales, pour différents groupes de clients partageant des caractéristiques communes

APA, Harvard, Vancouver, ISO, and other styles

44

Ringard, Justine. "Estimation des précipitations sur le plateau des Guyanes par l'apport de la télédétection satellite." Thesis, Guyane, 2017. http://www.theses.fr/2017YANE0010/document.

Full text

Abstract:

Le plateau des Guyanes est une région qui est caractérisée à 90% d’une forêt tropicale primaire et compte pour environ 20% des réserves mondiales d’eau douce. Ce territoire naturel, au vaste réseau hydrographique, montre des intensités pluviométriques annuelles atteignant 4000 mm/an ; ce qui fait de ce plateau une des régions les plus arrosées du monde. De plus les précipitations tropicales sont caractérisées par une variabilité spatiale et temporelle importante. Outre les aspects liés au climat, l’impact des précipitations dans cette région du globe est important en termes d’alimentation éner

APA, Harvard, Vancouver, ISO, and other styles

45

Bejaoui, Sayfeddine. "Evaluation des politiques de l'emploi : analyse théorique et micro-économétrique." Phd thesis, Université Paris Dauphine - Paris IX, 2013. http://tel.archives-ouvertes.fr/tel-00990099.

Full text

Abstract:

Dans cette thèse, nous dépassons le cadre binaire de l'évaluation et nous nous plaçons dans celui de plusieurs traitements, à l'instar de Brodaty et al. [2001], Larson [2000], Imbens [1999]. Les estimations effectuées portent sur les politiques de l'emploi en vigueur en France pendant la période 1997-1999. Trois programmes sont étudies : CIE (Contrat Initiative Emploi) emploi subventionné dans le secteur marchand, CES (Contrat Emploi-Solidarité) création d'emploi dans le secteur non marchand et SIFE (Stage d'Insertion par la Formation et l'Emploi). L'efficacité de ces dispositifs est évaluée n

APA, Harvard, Vancouver, ISO, and other styles

46

Sedrati, Youssef. "Courses de polynômes irréductibles dans les corps de fonctions." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0092.

Full text

Abstract:

Depuis bien longtemps, beaucoup de mathématiciens ont été fascinés par les nombres premiers. Ils ont étudié les propriétés de ces nombres et ont établi de nombreux théorèmes les concernant. Parmi ces résultats, on trouve le théorème fondamental de l'arithmétique qui affirme que tout entier plus grand que 1 s'écrit de façon unique comme un produit de nombres premiers. Grâce à ce théorème, ces nombres peuvent être perçus comme les briques élémentaires dans la construction des entiers strictement positifs. Les nombres premiers interviennent dans divers domaines, notamment dans l'algorithme RSA ut

APA, Harvard, Vancouver, ISO, and other styles

47

Habib, Marianne. "Influence des émotions sur la prise de décision chez l’enfant, l’adolescent et l’adulte : Comment le contexte socio-émotionnel et le développement des émotions contrefactuelles influencent-ils nos choix ?" Thesis, Paris 5, 2012. http://www.theses.fr/2012PA05H111/document.

Full text

Abstract:

L’objectif général de cette thèse est (i) d’examiner l’influence du contexte socio-émotionnel sur la prise de décision à risque, chez l’enfant, l’adolescent et l’adulte (ii) et de s’interroger sur la dynamique développementale des Types 1 (heuristique) et 2 (analytique) de raisonnement envisagés par les théories du double processus et de leur articulation avec la Prospect Theory. Selon nous, cette articulation permettra de mieux rendre compte de l’influence des émotions sur la sensibilité aux gains et aux pertes dans la prise de décision. Dans ce contexte, nous avons d’abord examiné l’influenc

APA, Harvard, Vancouver, ISO, and other styles

48

Kelly, Jodie. "Topics in the statistical analysis of positive and survival data." Thesis, Queensland University of Technology, 1998.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

49

Sarlon, Emmanuelle. "Stratégies palliatives à la non-randomisation en santé mentale : score de propension et techniques d’ajustement apparentées. Méthodologie appliquée à la prise en compte des facteurs de confusion dans le cas de la schizophrénie." Thesis, Paris 11, 2014. http://www.theses.fr/2013PA11T103/document.

Full text

Abstract:

Objectif : L’objectif est l’étude de plusieurs méthodes de prise en compte des facteurs de confusion, mesurés ou non mesurés, ce en situation observationnelle de population de patients psychotiques ou schizophrènes. Méthodes : Deux méthodes ont été utilisées : le score de propension (adaptés aux données mesurées) et les analyses de sensibilité (pour les informations non mesurées). Le champ d’application est celui de l’épidémiologie clinique en psychiatrie, et plus spécifiquement celui de la schizophrénie. Le développement s’appuie sur trois parties successives. La première partie met en exergu

APA, Harvard, Vancouver, ISO, and other styles

50

Ayme, Alexis. "Supervised learning with missing data : a non-asymptotic point of view." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS252.

Full text

Abstract:

Les valeurs manquantes sont courantes dans la plupart des ensembles de données du monde réel, en raison de la combinaison de sources multiples et d'informations intrinsèquement manquantes, telles que des défaillances de capteurs ou des questions d'enquête sans réponse. La présence de valeurs manquantes empêche souvent l'application d'algorithmes d'apprentissage standard. Cette thèse examinevaleurs manquantes dans un contexte de prédiction, visant à obtenir des prédictions précises malgré l'occurrence de données manquantes dans les données d'apprentissage et de test. L'objectif de cette thèse e

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!