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Dissertations / Theses on the topic 'Auxiliary variable'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Vanetti, Paul Justin Cesare. "Auxiliary variable transformations for intractable distributions." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44340.

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Expectations over probability distributions can be approximated by Markov chain Monte Carlo methods when the density can be evaluated up to a normalizing constant. However, there exist cases where this density takes on the form of an intractable integral and therefore cannot be computed exactly. We explore a class of auxiliary variable methods which allow correct sampling from such distributions. In some cases, existing approaches which employ these methods can be inefficient, requiring long computation times. We identify causes for this inefficiency and demonstrate how this can be improved wh

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2

Graham, Matthew McKenzie. "Auxiliary variable Markov chain Monte Carlo methods." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/28962.

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Markov chain Monte Carlo (MCMC) methods are a widely applicable class of algorithms for estimating integrals in statistical inference problems. A common approach in MCMC methods is to introduce additional auxiliary variables into the Markov chain state and perform transitions in the joint space of target and auxiliary variables. In this thesis we consider novel methods for using auxiliary variables within MCMC methods to allow approximate inference in otherwise intractable models and to improve sampling performance in models exhibiting challenging properties such as multimodality. We first con

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3

Sousa, Rita Cristina Pinto de. "Parameter estimation in the presence of auxiliary information." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11295.

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Dissertação para obtenção do Grau de Doutora em Estatística e Gestão de Risco, Especialidade em Estatística<br>In survey research, there are many situations when the primary variable of interest is sensitive. The sensitivity of some queries can give rise to a refusal to answer or to false answers given intentionally. Survey can be conducted in a variety of settings, in part dictated by the mode of data collection, and these settings can differ in how much privacy they offer the respondent. The estimates obtained from a direct survey on sensitive questions would be subject to high bias. A va

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4

Tüchler, Regina. "Bayesian Variable Selection for Logistic Models Using Auxiliary Mixture Sampling." Department of Statistics and Mathematics, WU Vienna University of Economics and Business, 2006. http://epub.wu.ac.at/984/1/document.pdf.

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The paper presents an Markov Chain Monte Carlo algorithm for both variable and covariance selection in the context of logistic mixed effects models. This algorithm allows us to sample solely from standard densities, with no additional tuning being needed. We apply a stochastic search variable approach to select explanatory variables as well as to determine the structure of the random effects covariance matrix. For logistic mixed effects models prior determination of explanatory variables and random effects is no longer prerequisite since the definite structure is chosen in a data-driven manner

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5

Mao, Wenjin. "Dimension jumping and auxiliary variable techniques for Markov chain Monte Carlo algorithms." 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:3284426.

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6

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.

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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

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7

Lasseigne, Alexis. "Optimization of variable-thickness composite structures. Application to a CROR blade." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEM006/document.

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Cette thèse aborde la problématique de la conception optimale de structures composites stratifiées d’épaisseur variable. Les variables d’empilement définissent un problème d’optimisation combinatoire et des espaces de décisions de grande taille et potentiellement multimodaux. Les algorithmes d’optimisation stochastiques permettent de traiter ce type de problème et de tirer profit des performances et de l’anisotropie des plis composites pour l’allègement des structures composites stratifiées. Le but de cette étude est double : (i) développer un algorithme d’optimisation dédié aux composites str

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8

Achelpohl, Scott Alan. "Analysis of an Existing Coal Fired Power Generation Facility with Recommendations for Efficiency and Production Improvement." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/378.

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This study examined the Lake of Egypt Power Plant operated by Southern Illinois Power Cooperative located on the Lake of Egypt south of Marion, IL. The facility has a 173 MW rated turbine operating on a pulverized coal cyclone boiler and three 33 MW rated turbines operating on an oversized circulating fluidized bed boiler with 120 MW capacity. The first area examined was reduction of auxiliary power consumption possible with the addition of variable frequency drives to the forced draft fan and booster fan motors. Included in this examination was an analysis of the economic and environmental

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9

Green, Jeffrey Andrew. "IMPROVING THE ENERGY EFFICIENCY OF A MID-SIZE POWER PLANT BY REDUCTION IN AUXILIARY POWER AND IMPROVED HEAT TRANSFER." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1502.

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This study incorporates the potential use of Variable Frequency Drives on various motors as well as areas of improved heat transfer in an older, mid-sized coal fired power plant. In power plants, fluid flow rates are often controlled using dampers or valves while the motors that power the pumps stay at full speed resulting in a significant amount of wasted electrical power; energy is also lost due to poor heat recovery prior to gases leaving the system. By examining pump usage as well as additional heat available for recovery, potential energy savings will be determined. Preliminary resul

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10

DE, PAOLA ROSITA. "Median estimation using auxiliary variables." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/36075.

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In the present study the estimation of the median has been taken into consideration using different methods of analysis. First of all the estimation of the median without auxiliary information is analyzed. Then the method of Kuk and Mak proposed in 1989 is exposed: this way of estimating the median is based on the knowledge of the population median of auxiliary variable X. Another method, which considers the median of the auxiliary variable is the ratio estimator. Then two methods based on the regression estimator are analyzed : the first one considers the regression based on the median

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11

Radišauskaitė, Simona. "Baigtinės populiacijos dviejų sumų santykio kalibruotieji įvertiniai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130805_110347-82806.

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Šiame darbe nagrinėjami dviejų sumų santykio kalibruotieji įvertiniai, kuriuose panaudojama daugiau negu po vieną kiekvieno tyrimo kintamojo papildomąjį kintamąjį. Naudojant skirtingas kalibravimo lygtis ir atstumo funkcijas čia sukonstruoti šeši tokio tipo įvertiniai. Taikant Teiloro ištiesinimo, visrakčio ir atsitiktinių grupių metodus sukonstruoti keleto naujų santykio įvertinių dispersijos įvertiniai. Modeliuojant nauji santykio įvertiniai lyginami tarpusavyje bei su standartiniu ir A. Plikuso įvertiniais. Tiriama, kaip įvertiniu tikslumą įtakoja imties dydis ir laisvai pasirenkami svoriai

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12

Farias, Rafael Braz Azevedo. "Regressão binária bayesiana com o uso de variáveis auxiliares." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-17062007-162004/.

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A inferência Bayesiana está cada vez mais dependente de algoritmos de simulação estocástica, e sua eficiência está diretamente relacionada à eficiência do algoritmo considerado. Uma prática bastante utilizada é a introdução de variáveis auxiliares para obtenção de formas conhecidas para as distribuições {\\it a posteriori} condicionais completas, as quais facilitam a implementação do amostrador de Gibbs. No entanto, a introdução dessas variáveis pode produzir algoritmos onde os valores simulados são fortemente correlacionados, fato esse que prejudica a convergência. O agrupamento das quantidad

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13

Lee, Anthony. "On auxiliary variables and many-core architectures in computational statistics." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:244040a7-f094-4d57-a78f-e154ed3b353c.

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Emerging many-core computer architectures provide an incentive for computational methods to exhibit specific types of parallelism. Our ability to perform inference in Bayesian statistics is often dependent upon our ability to approximate expectations of functions of random variables, for which Monte Carlo methodology provides a general purpose solution using a computer. This thesis is primarily concerned with exploring the gains that can be obtained by using many-core architectures to accelerate existing population-based Monte Carlo algorithms, as well as providing a novel general framework th

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14

Carlsson, Martin. "Variance Estimation of the Calibration Estimator with Measurement Errors in the Auxiliary Information." Thesis, Örebro universitet, Handelshögskolan vid Örebro Universitet, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-68928.

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15

Bailes, Wesley Wayne. "A comparison of basal area and merchantable height as auxiliary variables for double sampling with point sampling." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3385.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains xi, 116 p. : ill. (some col.), col. maps. Vita. Includes abstract. Includes bibliographical references (p. 55-56).

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Rota, Bernardo João. "Calibration Adjustment for Nonresponse in Sample Surveys." Doctoral thesis, Örebro universitet, Handelshögskolan vid Örebro Universitet, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-51966.

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In this thesis, we discuss calibration estimation in the presence of nonresponse with a focus on the linear calibration estimator and the propensity calibration estimator, along with the use of different levels of auxiliary information, that is, sample and population levels. This is a fourpapers- based thesis, two of which discuss estimation in two steps. The two-step-type estimator here suggested is an improved compromise of both the linear calibration and the propensity calibration estimators mentioned above. Assuming that the functional form of the response model is known, it is estimated i

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17

Ribes, Giner Gabriela. "Análisis de las variables organizativas que influyen en los procesos de fusión y adquisición de empresas. El caso de la industria auxiliar del automóvil." Doctoral thesis, Editorial Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/16926.

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El objetivo de esta tesis es examinar cómo influyen los factores organizativos y cómo influyen los factores culturales durante el proceso de fusión y adquisición de empresas proveedoras del sector automovilístico. La aplicación se realizará dentro de dicho sector, más concretamente en el de la industria proveedora de componentes, estudiando diferentes casos de fusión y adquisición de proveedores a primer nivel de suministro de los fabricantes de automóviles. Para conseguirlo se profundizará en el marco conceptual, pasando por una revisión general de las fusiones y adquisiciones (F/As), has

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18

Goga, Camelia. "Estimation de la variance dans les sondages à plusieurs échantillons et prise en compte de l'information auxiliaire par des modèles nonparamétriques." Rennes 2, 2003. http://www.theses.fr/2003REN20030.

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Cette thèse est consacrée à l'estimation de la variance et à l'utilisation de variables auxiliaires lorsqu'on dispose de plusieurs échantillons. Le premier chapitre, extrait d'un rapport rédigé pour Eurostat, présente une revue bibliographique sur les méthodes d'estimation de la variance en sondage ainsi que leur implémentation dans le logiciel Poulpe lorsque cela est possible. Nous définissons dans le chapitre 2 les plans de sondage bidimensionnels et nous donnons une formule de la variance de type Horvitz-Thompson pour des estimateurs linéaires qui dépendent des deux échantillons. Nous exhib

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19

Schelin, Lina. "Spatial sampling and prediction." Doctoral thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-53286.

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This thesis discusses two aspects of spatial statistics: sampling and prediction. In spatial statistics, we observe some phenomena in space. Space is typically of two or three dimensions, but can be of higher dimension. Questions in mind could be; What is the total amount of gold in a gold-mine? How much precipitation could we expect in a specific unobserved location? What is the total tree volume in a forest area? In spatial sampling the aim is to estimate global quantities, such as population totals, based on samples of locations (papers III and IV). In spatial prediction the aim is to estim

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20

Lardin, Pauline. "Estimation de synchrones de consommation électrique par sondage et prise en compte d'information auxiliaire." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00842199.

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Dans cette thèse, nous nous intéressons à l'estimation de la synchrone de consommation électrique (courbe moyenne). Etant donné que les variables étudiées sont fonctionnelles et que les capacités de stockage sont limitées et les coûts de transmission élevés, nous nous sommes intéressés à des méthodes d'estimation par sondage, alternatives intéressantes aux techniques de compression du signal. Nous étendons au cadre fonctionnel des méthodes d'estimation qui prennent en compte l'information auxiliaire disponible afin d'améliorer la précision de l'estimateur de Horvitz-Thompson de la courbe moyen

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21

Signorelli, Shirley Ferreira. "Um ambiente virtual para o ensino semipresencial de funções de uma variável real: design e análise." Pontifícia Universidade Católica de São Paulo, 2007. https://tede2.pucsp.br/handle/handle/11284.

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Made available in DSpace on 2016-04-27T16:58:33Z (GMT). No. of bitstreams: 1 Shirley Ferreira Signorelli.pdf: 4346228 bytes, checksum: a37d23996da101385ce1df722242946c (MD5) Previous issue date: 2007-10-31<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The purpose of this investigation was the elaboration and implementation of a virtual environment for a part time distance course for students of the Computer Science and Systems of Information. The students failed in a former discipline that approaches topics of elementary Mathematics. It happened in a particular university

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22

Qin, Hao. "Sécurité pratique de systèmes de cryptographie quantique : étude d'attaques et développement de contre-mesures." Electronic Thesis or Diss., Paris, ENST, 2015. http://www.theses.fr/2015ENST0040.

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Dans cette thèse, j’étudie une primitive cryptographique appelée distribution quantique de clés. La distribution quantique de clés permet à deux parties distantes de partager une clé secrète en présence d’une espion, dont la puissance est seulement limité par les lois de la physique quantique. J’ai concentré mon travail de thèse sur la distribution quantique de clés à variables continues et en particulier, sur l’étude pratique d’implémentations. J’ai proposé et étudié théoriquement une attaque par canaux cachés originale, visant les détecteurs : l’attaque par saturation. Nous avons de plus dém

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23

ALVES, Francisco Regis Vieira. "Aplicações da sequência Fedathi na promoção do raciocínio intuitivo no cálculo a várias variáveis." www.teses.ufc.br, 2011. http://www.repositorio.ufc.br/handle/riufc/3166.

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ALVES, Francisco Regis Vieira. Aplicações da sequência Fedathi na promoção do raciocínio intuitivo no cálculo a várias variáveis. 2011. 398f. Tese (Doutorado em Educação) – Universidade Federal do Ceará, Faculdade de Educação, Programa de Pós-Graduação em Educação Brasileira, Fortaleza-CE, 2011.<br>Submitted by Maria Josineide Góis (josineide@ufc.br) on 2012-07-11T14:43:16Z No. of bitstreams: 1 2011_Tese_ FRVALVES.pdf: 14201518 bytes, checksum: 22b6bb75fce50eeb927d7cdec1d5d361 (MD5)<br>Approved for entry into archive by Maria Josineide Góis(josineide@ufc.br) on 2012-07-11T15:04:21Z (GMT) No. o

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24

Bedier, Mostafa Abdellatif. "Post stratified estimation using a known auxiliary variable." Thesis, 1989. http://hdl.handle.net/1957/37984.

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Post stratification is considered desirable in sample surveys for two reasons - it reduces the mean squared error when averaged over all possible samples, and it reduces the conditional bias when conditioned on stratum sample sizes. The problem studied in this thesis is post stratified estimation of a finite population mean when there is a known auxiliary variable for each population unit. The primary direction of the thesis follows the lines of Holt and Smith (1979). A method is given for using the auxiliary variable in selection of the stratum boundaries and, using this approach to determine

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25

"Bayesian Variable Selection for Logistic Models Using Auxiliary Mixture Sampling." Department of Statistics and Mathematics, 2006. http://epub.wu-wien.ac.at/dyn/dl/wp/epub-wu-01_94d.

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26

(10669023), Fukeng Huang. "A new scalar auxiliary variable approach for general dissipative systems." Thesis, 2021.

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In this thesis, we first propose a new scalar auxiliary variable (SAV) approach for general dissipative nonlinear systems. This new approach is half computational cost of the original SAV approach, can be extended to high order unconditionally energy stable backward differentiation formula (BDF) schemes and not restricted to the gradient flow structure. Rigorous error estimates for this new SAV approach are conducted for the Allen-Cahn and Cahn-Hilliard type equations from the BDF1 to the BDF5 schemes in a unified form. As an application of this new approach, we construct high order unconditio

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27

Brozek, Jeffrey M. "A nonlinear model of an auxiliary commutated variable reluctance machine utilizing magnetic circuits." 1993. http://catalog.hathitrust.org/api/volumes/oclc/32495623.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1993.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 232-240).

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28

Chou, Tso-Chu, and 周佐竺. "Design of Constant Pressure Variable Flow Controls For Auxiliary Boiler Feed Water Pumps on Marine Vessels." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/2kedh5.

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Huang, Shih-Jhan, and 黃士展. "Optimal Variable Step-Size and Auxiliary Noise Power Scheduling for Active Noise Control Systems with Online Feedback Path Modeling." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98063132478057416596.

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碩士<br>國立中興大學<br>機械工程學系所<br>101<br>In practical case of active noise control (ANC) system structure for the dual microphones, by the reference microphone and the error microphone composed. The reference microphone will pick up a signal from the feedback path of the ANC system, causing the acoustic feedback problem. In general the FxLMS algorithm does not consider the acoustic feedback compensation, thus reducing the active noise control system performance, worse case may make active noise control system becomes unstable. To solve the problem of acoustic feedback, we use literature proposed the

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30

Elbaz, Malika. "L'estimation à l'aide d'une variable auxiliaire." Mémoire, 2010. http://www.archipel.uqam.ca/2927/1/M11369.pdf.

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Dans le domaine des sondages, il y a plusieurs méthodes d'estimer une moyenne ou un total d'une population. Une des techniques les plus pratiques est l'utilisation d'une variable auxiliaire ayant une corrélation avec la variable d'intérêt et dont les données sur toute la population sont connues. Dans ce mémoire, on va s'intéresser particulièrement à l'estimation d'une moyenne par le quotient. Dans ce cadre, on va traiter largement cette approche, en détaillant premièrement tout ce qui concerne l'estimateur par le quotient afin de répondre à toute question sur le sujet. Par la suite, on va étu

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Lai, Chieh-Hsin, and 賴潔馨. "Research And Development Auxiliary Tool for the Seventh Grade Learning Simultaneous Linear Equations in Two Variables." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/949km4.

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碩士<br>國立臺北教育大學<br>數學暨資訊教育學系(含數學教育碩士班)<br>99<br>Since the technology improved, many courses have developed suitable media auxiliary tools by computer which help teacher teaching and to understand the situation of students’ studying. This research tries to show the competence indicators of simultaneous linear equations in two variables by study-map with learning areas of mathematics in “General Guidelines of Grade 1-9 Curriculum of Elementary and Junior High School” published by Education Ministry of Education and students’ thinking. It also analyses the questions in test-tree of course by devel

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"Intrablock covariance analysis of partially balanced incomplete block design with p auxiliary variables and two associated classes." Tese, BIBLIOTECA CENTRAL DA UFLA, 2006. http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=153.

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Nekvinda, Matěj. "Statistické metody pro regresní modely s chybějícími daty." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-382737.

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The aim of this thesis is to describe and further develop estimation strategies for data obtained by stratified sampling. Estimation of the mean and linear regression model are discussed. The possible inclusion of auxiliary variables in the estimation is exam- ined. The auxiliary variables can be transformed rather than used in their original form. A transformation minimizing the asymptotic variance of the resulting estimator is pro- vided. The estimator using an approach from this thesis is compared to the doubly robust estimator and shown to be asymptotically equivalent.

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