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Dissertations / Theses on the topic 'Stratified sampling'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Platts, Alexander. "Functional quantization-based stratified sampling." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/27105.

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Functional quantization-based stratified sampling is a method for variance reduction proposed by Corlay and Pagès (2015). This method requires the ability to both create functional quantizers and to sample Brownian paths from the strata defined by the quantizers. We show that product quantizers are a suitable approximation of an optimal quantizer for the formation of functional quantizers. The notion of functional stratification is then extended to options written on multiple stocks and American options priced using the Longstaff-Schwartz method. To illustrate the gains in performance we focus

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Zhong, C. X. Bob. "Empirical likelihood inference under stratified sampling." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0032/NQ26890.pdf.

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Zhong, Bob Chongxin Carleton University Dissertation Mathematics and Statistics. "Empirical likelihood inference under stratified sampling." Ottawa, 1997.

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Ramalho, Esmeralda A. "Some sampling issues in econometrics." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248393.

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Liu, Jun Carleton University Dissertation Mathematics. "Inference from stratified samples: applications of Edgeworth Expansions." Ottawa, 1992.

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6

Vadrevu, Aditya M. "Random sampling estimates of fourier transforms antithetical stratified Monte Carlo /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p1450161.

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Thesis (M.S.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed Mar. 27, 2008). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 33-34).

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Sroka, Christopher J. "Extending Ranked Set Sampling to Survey Methodology." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1218543909.

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Gill, Abdul Aziz. "The use of stratified sampling to improve the performance of classification trees." Thesis, University of East Anglia, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410087.

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In this thesis we study two primary areas for improvement in classification trees, namely accuracy and consistency of prediction. Classification trees are generally easier for humans to comprehend and have been used in a wide range of disciplines including medical sciences and statistics. This thesis reviews existing improvement techniques in detail and addresses those areas where the existing techniques show poor performance. Additionally, their strengths and weaknesses/ limitations in the light of statistical background have been investigated. Some important contributing factors towards impr

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Brown, Stephanie N. "A New Era of Educational Assessment: the Use of Stratified Random Sampling in High Stakes Testing." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc407797/.

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Although sampling techniques have been used effectively in education research and practice it is not clear how stratified random sampling techniques apply to high-stakes testing in the current educational environment. The present study focused on representative sampling as a possible means for reducing the quantity of state-administered tests in Texas public education. The purpose of this study was two-fold: (1) to determine if stratified random sampling is a viable option for reducing the number of students participating in Texas state assessments, and (2) to determine which sampling rate pro

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Song, Chenxiao. "Monte Carlo Variance Reduction Methods with Applications in Structural Reliability Analysis." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29801.

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Monte Carlo variance reduction methods have attracted significant interest due to the continuous demand for reducing computational costs in various fields of application. This thesis is based on the content of a collection of six papers contributing to the theory and application of Monte Carlo methods and variance reduction techniques. For theoretical developments, we establish a novel framework of Monte Carlo integration over simplices, throughout from sampling to variance reduction. We also investigate the effect of batching for adaptive variance reduction, which aims at running the Monte Ca

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Abouelenien, Mohamed. "Boosting for Learning From Imbalanced, Multiclass Data Sets." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc407775/.

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In many real-world applications, it is common to have uneven number of examples among multiple classes. The data imbalance, however, usually complicates the learning process, especially for the minority classes, and results in deteriorated performance. Boosting methods were proposed to handle the imbalance problem. These methods need elongated training time and require diversity among the classifiers of the ensemble to achieve improved performance. Additionally, extending the boosting method to handle multi-class data sets is not straightforward. Examples of applications that suffer from imbal

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Alexandrino, Eduardo Roberto. "Amostragem de avifauna urbana por meio de pontos fixos: verificando a eficiência do método." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/91/91131/tde-20092010-102906/.

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A urbanização é uma das ações antrópicas que mais crescem no mundo atual. Por este motivo pesquisas ecológicas são realizadas nas cidades com o objetivo de reconhecer seus impactos, e as aves são utilizadas como uma das ferramentas para diagnóstico ambiental. Assim, o presente estudo avaliou o método de levantamento de aves por ponto fixo, método amplamente utilizado em estudos com aves em diversos ambientes. Foram analisados três pontos que podem influenciar a amostragem de aves através deste método: 1) o habitat onde o levantamento é realizado, observando a composição dos elementos urbanos e

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Chavarria, Pedro Mazier. "Assessing the impact of feral hog populations on the natural resources of Big Thicket National Preserve." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1212.

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Shu, Gang. "Statistical Estimation of Software Reliability and Failure-causing Effect." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1405509796.

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Žakienė, Inesa. "Horvico ir Tompsono įvertinio dispersijos vertinimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120813_131528-29461.

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Šiame magistro diplominiame darbe, naudojant skirtingas atstumo funkcijas ir kalibravimo lygtis, išvedami Horvico ir Tompsono įvertinio dispersijos įvertinių svoriai. Tokiu būdu, sukonstruojami aštuoni nauji Horvico ir Tompsono įvertinio dispersijos įvertiniai. Naudojant Teiloro ištiesinimo metodą pateikiamos sukonstruotų įvertinių apytikslės dispersijos ir pasiūlyti šių dispersijų įvertiniai. Be to, darbe atliekamas matematinis modeliavimas, kurio eksperimentai atlikti naudojant darbo autorės sukurtas MATLAB programas. Matematinio modeliavimo tikslas - naujus įvertinius palyginti tarpusavyje

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Barroso, Juarez Coelho. "AvaliaÃÃo da Pesca da Lagosta Vermelha (Panulirus argus) e da Lagosta verde (Panulirus laevicauda) na Plataforma Continental do Brasil." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7259.

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CoordenaÃÃo de AperfeiÃoamento de NÃvel Superior<br>A pesca extrativa de lagosta no Brasil Ã uma atividade econÃmica importante que engloba diferentes setores sociais na regiÃo costeira e que aporta um ingresso mÃdio anual de 84 milhÃes de dÃlares. A grande demanda do produto, o elevado valor no mercado internacional, a expansÃo da frota artesanal, o nÃo cumprimento das medidas de conservaÃÃo, o impacto da pesca no ecossistema e possivelmente a variabilidade do clima, tem propiciado uma elevada explotaÃÃo ou sobre-explotaÃÃo dos estoques destes crustÃceos. A avaliaÃÃo e previsÃo da pescaria de

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Barroso, Juarez Coelho. "Avaliação da Pesca da Lagosta Vermelha (Panulirus argus) e da Lagosta verde (Panulirus laevicauda) na Plataforma Continental do Brasil." reponame:Repositório Institucional da UFC, 2012. http://www.repositorio.ufc.br/handle/riufc/18432.

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BARROSO, Juarez Coelho. Avaliação da Pesca da Lagosta Vermelha (Panulirus argus) e da Lagosta verde (Panulirus laevicauda) na Plataforma Continental do Brasil. 2012. 109 f. : Dissertação (mestrado) - Universidade Federal do Ceará, Centro de Ciências Agrárias, Departamento de Engenharia de Pesca, Fortaleza-CE, 2012<br>Submitted by Nádja Goes (nmoraissoares@gmail.com) on 2016-07-18T13:17:31Z No. of bitstreams: 1 2012_dis_jcbarroso.pdf: 2594115 bytes, checksum: ce2b67584a13e444ae16d1c1c08898f1 (MD5)<br>Approved for entry into archive by Nádja Goes (nmoraissoares@gmail.com) on 2016-07-18T13:17:44Z

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Falk, Matthew Gregory. "Incorporating uncertainty in environmental models informed by imagery." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33235/1/Matthew_Falk_Thesis.pdf.

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In this thesis, the issue of incorporating uncertainty for environmental modelling informed by imagery is explored by considering uncertainty in deterministic modelling, measurement uncertainty and uncertainty in image composition. Incorporating uncertainty in deterministic modelling is extended for use with imagery using the Bayesian melding approach. In the application presented, slope steepness is shown to be the main contributor to total uncertainty in the Revised Universal Soil Loss Equation. A spatial sampling procedure is also proposed to assist in implementing Bayesian melding given th

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CHEN, YI-RU, and 陳怡如. "TWO PROBLEMS IN STRATIFIED RANDOM SAMPLING." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/05640244703704662008.

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碩士<br>東海大學<br>統計學系<br>93<br>This thesis is about survey sampling. We take up two areas to study further. One is the problem of post-stratification – the decision to stratify a simple random sample after it is already collected. Another is the application of stratified random sampling for the regression estimation problem. For notation and general concepts, in Chapter 1 we give a short introduction to survey sampling in general and stratified random sampling in particular. In Chapter 2, we study the problems of poststratification. Why after a simple random sample is collected, we need to

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Tsai, Jenq-Horng, and 蔡政弘. "Application of GIS Techniques for Forest Stratified Sampling Design." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/86703921825423123462.

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碩士<br>國立中興大學<br>森林學系<br>85<br>When reviewing the previous studies , we found that the Geographic Information Systems (GIS) applied in forest inventory by overlay analysis only. The paper is focused on using spatial analysis techniques of GIS to study the sampling allocation and sample-plot building of the Hsin-hua Experiment Forest Station. In sampling allocation, the spatial analysis of GIS was used in three sampling allocation methods. These included proportional allo

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謝銘訓. "A study on the discriminant function in stratified sampling." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/72080879342279480170.

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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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李琇玉. "On the Inference about the Mean under Stratified Random Sampling." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/97440428656372965241.

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博士<br>國立交通大學<br>經營管理研究所<br>94<br>It is of interest to make inference about the mean for a population consisting of different strata. Assuming that prior probabilities of strata and normality of the measure are given, traditional methods require that the equality of within-stratum variances be first examined. If the variances are equal, then use the exact t statistic; otherwise use the approximate t statistic. In this study, we have investigated the necessity of the equal-variance assumption for the exact t statistic by comparing the power of the two t tests. Based on extensive Monte Carlo simu

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陸坤義. "Mining Interesting Association Rules by Stratified Sampling and Moment-Preserving Thresholding." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/64235456463215013460.

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碩士<br>東海大學<br>資訊工程與科學系<br>91<br>Data mining is a very important issue; the association rule mining is the mostly studied one due to the wide applications among the proposed mining methods. The association mining problem should be proceeding by efficient algorithm; it could be divided into two phases. Phase 1: mining frequent itemsets from database. Phase 2: using frequent itemsets to generate the association rules. The proposed algorithm is based on stratified sampling and moment-preserving thresholding approach. Because of the reducing size of dataset, the proposed algorithm is efficient for

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Li, Chia-Shuan, and 李佳璇. "Using Series-Parallel Reduction and Stratified Sampling in Estimating Network Relibility." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/x35ss3.

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碩士<br>國立臺灣科技大學<br>資訊管理系<br>95<br>In order to evaluate the performance of a complicated stochastic network system, network reliability is a decisive key factor to the administrator. The purpose of this paper is to obtain a more accurate estimator within limited time. Because numerical evaluation method for network reliability is an NP-hard problem, an alternative approach to the exact evaluation is to estimate network reliability using computer simulation. Crude Monte Carlo method suffers from requiring large sampling efforts when the network is highly reliable, so variance reduction techniques

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Huang, Yi-Chen, and 黃怡媜. "The Comparison of Chi-square Tests on Contigency Table under Stratified Sampling." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/96318487370460310200.

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Yeh, Jih-chun, and 葉日鈞. "A Simple Recursive Importance and Stratified Sampling Scheme for Stochastic Network Reliability Estimation." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/v5qquu.

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博士<br>國立臺灣科技大學<br>資訊管理系<br>100<br>Crude simulation for estimating reliability of a tochastic network often requires large sample size to obtain statistically significant results. In this paper, we propose a simple recursive importance and stratified sampling estimator which is shown to be unbiased and achieve smaller variance. Preallocation of sampling efforts of size two to each undetermined subnetwork on each stage makes it possible to estimate the variance of the proposed estimator and significantly enhances the effectiveness of variance reduction from stratification by deferring the termin

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JI, PEI-YU, and 紀佩妤. "A Study on Variance of Estimation under Stratified Multi-Stage Cluster Sampling Designs." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/37956788696388705374.

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碩士<br>國立臺北大學<br>統計學系<br>104<br>In most of the Sampling Survey textbooks, the discussion of variance of estimation only upto stratified sampling, cluster sampling, two-stage cluster sampling, etc.Cochran (1977) provided the formula of variance estimation of unbiased estimator under tow- three-stage sampling procedure. In this study we used the longitudinal data collected by PSFD in 1999 to explore the effect of variance estimations of three estimator under multi-stage sampling procedure.The PSFD data set in 1999, were sampling under 9 stratified areas and each area were sampling by tree-stage c

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Tsai, MinFu, and 蔡明富. "Mining the Commonality of Credit Card Holders Based on Stratified Sampling and Rule Induction." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/32279945613721432795.

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碩士<br>東海大學<br>資訊工程與科學系碩士在職專班<br>93<br>In the advent of plastic cash, eventually we changed the spending and saving habits. According to the statistics of the Department of Finance announced in October 2003, the cyclic credit amount has increased 32.33 percent compared with one year ago. The cumulated interests and annual revenues increased 31.4 percent compared with same period of last year, as well. What is the implication concealed on this report? What should credit card issuing institutions respond to this information? The cyclic credit from the cardholders is the main income of issuing ban

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Chen, Chien-Ming, and 陳建銘. "A Comparative Analysis among Estimators of Regression Coefficients under Stratified Sampling with Unequal Probability." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/31308322000706436114.

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碩士<br>國立臺北大學<br>統計學系<br>96<br>This paper aims to compare the estimators of regression coefficients under stratified sampling with unequal probability based upon a Monte Carlo approach. Recently, regression analysis has become popular with complex surveys. This paper intends to compare alternative estimators for regression coefficients under a complex survey. The alternative estimators used in this paper include least squares estimator, stratified weighted least squares estimator, probability weighted least squares estimator, and Quasi-Aitken weighted least squares estimator. Least squares meth

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LI, SHU-NUAN, and 李淑暖. "Missing-data Imputation and Corresponding Estimator Adjustment for Stratified Sampling with Probability Proportional to Size." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/47916447326921886660.

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碩士<br>國立臺北大學<br>統計學系<br>92<br>In the presence, missing-data occurs frequently. It may loss important information to delete survey units with missing-data. Imputation is one methods to solve missing-data problem. Ratio imputation contains weighted and unweighted alternatives. From previous studies we have the following conclusions: (1) estimator of a population mean under weighted ratio imputation is approximately unbiased and (2) estimator of a population mean under unweighted ratio imputation is biased. Haziza and Rao (2003) proposed a bias-adjusted estimator of population mean under unw

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Fisher, Scott W. "A comparison of the basket method and stratified random sampling for contract change order negotiations." Thesis, 1987. http://hdl.handle.net/10945/22671.

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YAN, SIN-JHE, and 顏新哲. "A Study on Variance of Estimation under Stratified Multi-Stage Cluster Sampling Designs data with multiple frame and raking." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/cw3b42.

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碩士<br>國立臺北大學<br>統計學系<br>105<br>In order to have a more complete sample, according to Bankier (1986), The Panel Study of Family Dynamics (PSFD) project of Research Center for Humanities and Social Sciences was integrated by multiple frame. The sample data is RI1999 and RI2000 and RI2003 were the first surveys in the first wave in 1999, the first survey of the second wave in 2000, the third survey of the third wave in 2003. The three surveys cover all age ranges in the major sample of Panel Study of Family Dynamics (PSFD) project. This study integrated the three wave samples mentioned in the

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Šedová, Michaela. "Odhad parametru při dvoufázovém stratifikovaném a skupinovém výběru." Doctoral thesis, 2011. http://www.nusl.cz/ntk/nusl-299533.

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Title: Parameter Estimation under Two-phase Stratified and Cluster Sampling Author: Mgr. Michaela Šedová Department: Department of Probability and Mathematical Statistics Supervisor: Doc. Mgr. Michal Kulich, Ph.D. Abstract: In this thesis we present methods of parameter estimation under two-phase stratified and cluster sampling. In contrast to classical sampling theory, we do not deal with finite population parameters, but focus on model parameter inference, where the ob- servations in a population are considered to be realisations of a random variable. However, we consider the sampling scheme

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Cheng, Chih-Hung, and 鄭志鴻. "The establishment and application of data cleaning and stratified sampling design for the growth and development data bank among children in elementary school in Taiwan." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/36066003704623427639.

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碩士<br>國立陽明大學<br>臨床暨社區護理研究所<br>98<br>Abstract Background: Obesity in children is a growing problem. However, there is a lack of integrated sampling modes in existing census data of elementary school children on health examinations. It results in a growth and development database of elementary school children that has less than 90% response rate and cannot completely represent Taiwan or provide parents, schools and governments with a solid foundation to help promote student health and sports. Purpose: This study explores and analyzes the height, weight and body mass index of Taiwanese elementar

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CHIANELLA, DIEGO. "Estimation of the variance for different estimators of the change over time for overlapping samples." Doctoral thesis, 2019. http://hdl.handle.net/11573/1315826.

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This work was inspired by the growing need to have a measure of the accuracy of the estimates produced within the short-term statistics in the Official Statistics. In particular, the aim of the work is to illustrate the methodology for the computation of the variance for the estimators currently used in the service turnover survey carried on by the Italian National Institute of Statistics, for the quarterly turnover growth rate estimation. While the calculation of the variance of the estimates produced for a given instant of time is now a good practice (also through the development of softwa

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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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Thackway, Richard Malcom. "Analysis of techniques for mapping environments for fauna survey." Master's thesis, 1985. http://hdl.handle.net/1885/15431.

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A discussion of environmental land classification is presented for the purpose of surveying avifaunal communities. Surveying and mapping land uses the term environment in a special sense. Environment can be mapped into regions whose components are interacting climate terrain, geology, soils and biota. The problem of how to describe the environment for sampling fauna requires an approach which samples the inherent and known variability of all environmental regions present. Discovery of patterns between fauna and environment provide the basis for understanding species/habitat relationships an

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Garbacz, Justyna. "Evaluation of the impact of a mega-sporting event : perception of warsaw residents' toward 2012 UEFA EURO." Master's thesis, 2013. http://hdl.handle.net/1822/27528.

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Dissertação de mestrado em Economics, Markets and Public Policies<br>Abstract: Hosting a mega-sporting event, such as the UEFA European Championship in 2012, was a big challenge for a developing economy like Poland. The Polish government had plans for the modernization of the entire country. Organizing a mega-sporting event brings with it many costs which may not be covered by future economic gains. Nevertheless, an enterprise like this also triggers numerous non-monetary benefits, which can compensate for the costs incurred. EURO 2012 was a great experience for the Polish people, and one whic

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