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Dissertations / Theses on the topic 'Sample surveys'

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Published: 4 June 2021
Last updated: 16 February 2022

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1

Lau, Cheung-na. "Interviewer effects in sample surveys." [Hong Kong] : University of Hong Kong, 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13064794.

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2

劉長拿 and Cheung-na Lau. "Interviewer effects in sample surveys." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31976566.

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3

Laurence, A. F. "Imputation and variance estimation in sample surveys." Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371146.

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4

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 in the first step using calibration approach. In the second step the linear calibration estimator is constructed replacing the design weights by products of these with the inverse of the estimated response probabilities in the first step. The first step of estimation uses sample level of auxiliary information and we demonstrate that this results in more efficient estimated response probabilities than using population-level as earlier suggested. The variance expression for the two-step estimator is derived and an estimator of this is suggested. Two other papers address the use of auxiliary variables in estimation. One of which introduces the use of principal components theory in the calibration for nonresponse adjustment and suggests a selection of components using a theory of canonical correlation. Principal components are used as a mean to accounting the problem of estimation in presence of large sets of candidate auxiliary variables. In addition to the use of auxiliary variables, the last paper also discusses the use of explicit models representing the true response behavior. Usually simple models such as logistic, probit, linear or log-linear are used for this purpose. However, given a possible complexity on the structure of the true response probability, it may raise a question whether these simple models are effective. We use an example of telephone-based survey data collection process and demonstrate that the logistic model is generally not appropriate.
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5

Lundquist, Peter. "Estimating Interviewer Effects in Sample Surveys : Some Contributions." Doctoral thesis, Stockholm : Department of Statistics, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1295.

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6

O'Muircheartaigh, Colm Aongus. "An investigation of response variance in sample surveys." Thesis, London School of Economics and Political Science (University of London), 2000. http://etheses.lse.ac.uk/1624/.

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The dissertation considers response variance in sample surveys in the broader context of survey quality and survey error. Following a historical review of the evolution of both the terms and the concepts a brief overview is given of earlier research in the area. The principal content of the dissertation draws on investigations carried out by the author over the last thirty years. There are three separate strands of argument, each associated with a particular approach to the analysis. First there is the descriptive (simple diagnostic) orientation of establishing the circumstances under which (or if) response variance arises, the associated issue of how it should be accommodated in analysis - primarily estimating the impact on the variance of univariate statistics - and an assessment of its likely order of magnitude. Second, there is the model-assisted orientation which attempts to decompose the effects into their constituent parts: one approach is to incorporate the correlating source (cluster or interviewer for example) as a term or terms in other models that we are estimating so that the effect is incorporated into the estimation of these models; the other is to model the response error itself -- in doing this we are trying to decompose it into its constituent parts. Third, and most radical, is to view error as information. By conceptualizing the process that generated the errors as a substantive process rather than as a set of nuisance effects we can extract from the results of the process information about both the process and the subject matter. Any particular piece of analysis may include any combination of these three approaches. The dissertation draws on special studies incorporated into a number of major sample surveys. Two principal data sets are involved. The first arises from a special investigation of response error carried out in conjunction with the World Fertility Survey; the second is the reinterview data set from the Current Population Survey carried out by the US Bureau of the Census. Four other surveys are used; an absenteeism survey in Ireland, two cross-sectional British surveys (one on Noise Annoyance, the other on Physical Handicap), and a British panel survey (the British Household Panel Survey).
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7

Wafula, Charles. "Some contributions to variance estimation in sample surveys." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330191.

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8

Oshungade, I. O. "Nonresponse and ratio estimation problems in sample surveys." Thesis, University of Essex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380376.

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9

Yin, Jiani. "Bayesian Nonparametric Models for Multi-Stage Sample Surveys." Digital WPI, 2016. https://digitalcommons.wpi.edu/etd-dissertations/197.

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It is a standard practice in small area estimation (SAE) to use a model-based approach to borrow information from neighboring areas or from areas with similar characteristics. However, survey data tend to have gaps, ties and outliers, and parametric models may be problematic because statistical inference is sensitive to parametric assumptions. We propose nonparametric hierarchical Bayesian models for multi-stage finite population sampling to robustify the inference and allow for heterogeneity, outliers, skewness, etc. Bayesian predictive inference for SAE is studied by embedding a parametric model in a nonparametric model. The Dirichlet process (DP) has attractive properties such as clustering that permits borrowing information. We exemplify by considering in detail two-stage and three-stage hierarchical Bayesian models with DPs at various stages. The computational difficulties of the predictive inference when the population size is much larger than the sample size can be overcome by the stick-breaking algorithm and approximate methods. Moreover, the model comparison is conducted by computing log pseudo marginal likelihood and Bayes factors. We illustrate the methodology using body mass index (BMI) data from the National Health and Nutrition Examination Survey and simulated data. We conclude that a nonparametric model should be used unless there is a strong belief in the specific parametric form of a model.
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10

Gao, Sujuan. "Estimation of variance components with applications in sample surveys." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293209.

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11

Glenn, Joe Edgar. "Cohesion in a Utah Sample of Latter-Day Saint Couples." Diss., CLICK HERE for online access, 1988. http://patriot.lib.byu.edu/u?/MTGM,3318.

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12

Domrow, Nathan Craig. "Design, maintenance and methodology for analysing longitudinal social surveys, including applications." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16518/.

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This thesis describes the design, maintenance and statistical analysis involved in undertaking a Longitudinal Survey. A longitudinal survey (or study) obtains observations or responses from individuals over several times over a defined period. This enables the direct study of changes in an individual's response over time. In particular, it distinguishes an individual's change over time from the baseline differences among individuals within the initial panel (or cohort). This is not possible in a cross-sectional study. As such, longitudinal surveys give correlated responses within individuals. Longitudinal studies therefore require different considerations for sample design and selection and analysis from standard cross-sectional studies. This thesis looks at the methodology for analysing social surveys. Most social surveys comprise of variables described as categorical variables. This thesis outlines the process of sample design and selection, interviewing and analysis for a longitudinal study. Emphasis is given to categorical response data typical of a survey. Included in this thesis are examples relating to the Goodna Longitudinal Survey and the Longitudinal Survey of Immigrants to Australia (LSIA). Analysis in this thesis also utilises data collected from these surveys. The Goodna Longitudinal Survey was conducted by the Queensland Office of Economic and Statistical Research (a portfolio office within Queensland Treasury) and began in 2002. It ran for two years whereby two waves of responses were collected.
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13

Holmström, Hampus. "Data acquisition for forestry planning by remote sensing based sample plot imputation /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-6086-7.pdf.

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14

Ho, Yue-tim. "The perceptions of school effectiveness by a sample of Hong Kong school principals." Click to view the E-thesis via HKUTO, 1987. http://sunzi.lib.hku.hk/HKUTO/record/B38627218.

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15

Jensen, Trey W., M. Vivek, Kyle S. Dawson, Scott F. Anderson, Julian Bautista, Dmitry Bizyaev, William N. Brandt, et al. "SPECTRAL EVOLUTION IN HIGH REDSHIFT QUASARS FROM THE FINAL BARYON OSCILLATION SPECTROSCOPIC SURVEY SAMPLE." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622676.

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We report on the diversity in quasar spectra from the Baryon Oscillation Spectroscopic Survey. After filtering the spectra to mitigate selection effects and Malmquist bias associated with a nearly flux-limited sample, we create high signal-to-noise ratio composite spectra from 58,656 quasars (2.1 <= z <= 3.5), binned by luminosity, spectral index, and redshift. With these composite spectra, we confirm the traditional Baldwin effect (BE, i. e., the anticorrelation of C IV equivalent width ( EW) and luminosity) that follows the relation W-lambda alpha L-beta w with slope beta(w) = -0.35 +/- 0.004, -0.35 +/- 0.005, and -0.41 +/- 0.005 for z. =. 2.25, 2.46, and 2.84, respectively. In addition to the redshift evolution in the slope of the BE, we find redshift evolution in average quasar spectral features at fixed luminosity. The spectroscopic signature of the redshift evolution is correlated at 98% with the signature of varying luminosity, indicating that they arise from the same physical mechanism. At a fixed luminosity, the average C IV FWHM decreases with increasing redshift and is anti-correlated with C IV EW. The spectroscopic signature associated with C IV FWHM suggests that the trends in luminosity and redshift are likely caused by a superposition of effects that are related to black hole mass and Eddington ratio. The redshift evolution is the consequence of a changing balance between these two quantities as quasars evolve toward a population with lower typical accretion rates at a given black hole mass.
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16

Chan, Yuk-kwong. "An investigation into the administrative difficulties encountered by assistant principals in a sample of aided secondary schools in Hong Kong." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18810494.

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17

Go, Cheung-ngai Alfred. "Organizational health in a sample of Hong Kong secondary schools implications for school administration /." Click to view the E-thesis via HKUTO, 1987. http://sunzi.lib.hku.hk/HKUTO/record/B38627188.

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18

Cornish, Disa Karin Viktoria Lubker. "Theoretical context of a common reproductive health behavior vaginal douching among a national sample of young adult women /." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2009p/cornish.pdf.

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19

Ramrakha, Sandhya, and n/a. "The link between mental health problems and sexual risk taking in a general population sample." University of Otago. Dunedin School of Medicine, 2009. http://adt.otago.ac.nz./public/adt-NZDU20090527.155127.

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This thesis examined whether mental health problems and sexual risk taking were associated in a general population sample and if so, the extent and direction of this association. The thesis begins with a review of theories of risk taking; sexual risk and mental health correlates; and the existing studies linking mental health and sexual risk taking. Three empirical studies were conducted. Study One produced new evidence that a range of psychiatric disorders were linked to early sex (<16 years), risky sex (multiple partners and inconsistent condom use in the past year at age 21) and sexually transmitted infections (STIs) by the age of 21 years. Young people who present with schizophrenia spectrum disorder were also prone to early and risky sex and STIs. Second, depression, the single most common psychiatric problem in the population, was also associated with risky sex and STIs. The risk increased with comorbid psychiatric conditions. Study Two addressed the issue of directionality, specifically examining if childhood behavioural and emotional problems and early adolescent psychiatric disorder predicted later sexual risk taking and STIs. Main findings showed that childhood antisocial behaviour increased the likelihood of risky and early sex, and that low levels of childhood anxiety increased the likelihood of later risky sex and having STIs. Involvement with delinquent peers mediated the association between childhood antisocial behaviour and risky and early sex. To a lesser degree, attachment to parents mediated the association between antisocial behaviour and early sex. These factors did not mediate the association between low levels of childhood anxiety and later sexual outcomes. No associations were found between adolescent psychiatric disorder and later sexual risk taking, with the exception of conduct disorder. However, it is important to note that by excluding the group who had early sex in order to establish temporality, other behaviours of interest exhibited by this group were also excluded. The third study examined whether sexual risk taking was associated with an increased risk of subsequent mental health problems, addressing the issue of directionality in the other direction. Main findings showed that reports of early sex, multiple sex partners and STIs elevated the risk of later substance dependence disorders. Importantly, this association persisted after controlling for �baseline� levels of psychiatric disorder. Early sex also predicted later conduct disorder, even after controlling for prior conduct disorder. In contrast, early sex, multiple sex partners and acquisition of STIs were unrelated to later diagnoses of anxiety or depression. The significant associations with multiple sex partners and STIs were also shown for incident cases of substance dependence. Moderation analyses revealed no differences between the sexes in any of the studies except in Study Three. Specifically, the association between multiple sex partners and substance dependence appeared to be stronger for males than females for up to 10 sex partners and substantially stronger for females than for males beyond ten sex partners. The final chapter in this thesis reviews the strengths and weaknesses of the studies in this thesis before considering the implications of the results for theory, research and practice.
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20

Kellermann, Anh Pham. "Missing Data in Complex Sample Surveys: Impact of Deletion and Imputation Treatments on Point and Interval Parameter Estimates." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7633.

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The purpose of this simulation study was to evaluate the relative performance of five missing data treatments (MDTs) for handling missing data in complex sample surveys. The five missing data methods included in this study were listwise deletion (LW), single hot-deck imputation (HS), single regression imputation (RS), hot-deck-based multiple imputation (HM), and regression-based multiple imputation (RM). These MDTs were assessed in the context of regression weight estimates in multiple regression analysis in complex sample data with two data levels. In this study, the multiple regression equation had six regressors without missing data and two regressors with missing data. The four performance measures used in this study were statistical bias, RMSE, CI width, and coverage probability (i.e., 95%) of the confidence interval. The five MDTs were evaluated separately for three types of missingness: MCAR, MAR, and MNAR. For each type of missingness, the studied MDTs were evaluated at four levels of missingness (10%, 30%, 50%, and 70%) along with complete sample conditions as a reference point for interpretation of results. In addition, ICC levels (.0, .25, .50) and high and low density population were also manipulated as studied factors. The study’s findings revealed that the performance of each individual MDT varied across missing data types, but their relative performance was quite similar for all missing data types except for LW’s performance in MNAR. RS produced the most inaccurate estimates considering bias, RMSE, and coverage of confidence interval; RM and HM were the second poorest performers. LW as well as HS procedure outperformed the rest on the measures of accuracy and precision in MCAR; however LW’s measures of precision decreased in MAR and MNAR, and LW’s CI width was the widest in MNAR data. In addition, in all three missing data types, those poor performers were less accurate and less precise on variables with missing data than they were on variables without missing data; and the degree of accuracy and precision of these poor performers depended mostly on the level of data ICC. The proportion of missing data only noticeably affected the performance of HM such that in higher missing data levels, HM yielded worse performance measures. Population density factor had negligible effects on most of the measures produced by all studied MDTs except for RMSE, CI width, and CI coverage produced by LW which were modestly influenced by population density.
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21

Kwok, Chi-yan Patrick. "Factors affecting the job satisfaction of a sample of vice-principals in aided secondary schools in Hong Kong." Hong Kong : University of Hong Kong, 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18033143.

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22

Go, Cheung-ngai Alfred, and 吳長毅. "Organizational health in a sample of Hong Kong secondary schools: implications for school administration." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B38627188.

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23

Yau, Yuk-lin Bianca. "The careers of a sample of senior graduate masters and mistresses in Hong Kong aided secondary schools implications for school administration /." Click to view the E-thesis via HKUTO, 1987. http://sunzi.lib.hku.hk/HKUTO/record/B38626937.

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24

Raffensperger, Sarah Kathryn. "The effects of race and predictors of socioeconomic status on diet quality in the Healthy Aging in Neighborhoods of Diversity across the Life Span (HANDLS) study sample." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 105 p, 2009. http://proquest.umi.com/pqdweb?did=1885562161&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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25

Chan, Yuk-kwong, and 陳玉光. "An investigation into the administrative difficulties encountered by assistant principals in a sample of aided secondary schools in HongKong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31959295.

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26

Wong, Sze Lo-sai. "Problems encountered in school administration in a sample of new aided secondary schools in Hong Kong." Click to view the E-thesis via HKUTO, 1987. http://sunzi.lib.hku.hk/HKUTO/record/B38626913.

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27

Hochheimer, Camille J. "Methods for evaluating dropout attrition in survey data." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5735.

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As researchers increasingly use web-based surveys, the ease of dropping out in the online setting is a growing issue in ensuring data quality. One theory is that dropout or attrition occurs in phases that can be generalized to phases of high dropout and phases of stable use. In order to detect these phases, several methods are explored. First, existing methods and user-specified thresholds are applied to survey data where significant changes in the dropout rate between two questions is interpreted as the start or end of a high dropout phase. Next, survey dropout is considered as a time-to-event outcome and tests within change-point hazard models are introduced. Performance of these change-point hazard models is compared. Finally, all methods are applied to survey data on patient cancer screening preferences, testing the null hypothesis of no phases of attrition (no change-points) against the alternative hypothesis that distinct attrition phases exist (at least one change-point).
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28

Ho, Yue-tim, and 何如添. "The perceptions of school effectiveness by a sample of Hong Kong school principals." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B38627218.

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29

Ma, Lai-yin Agnes. "Effects of match-to-sample cueing on the teaching of Chinese word reading to preschool children with mild learning difficulties." [Hong Kong : University of Hong Kong], 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12336397.

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30

Sanchez, Marchelle Elizabeth. "Analyzing the Effects of Adolescent Risky Behaviors on Suicidal Ideation." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/math_theses/21.

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This study is an analysis of adolescent risk behaviors contributing to an increased rate of suicidal ideation for 12 to 18 year olds. The Youth Risk Behavior Surveillance System Survey (YRBSS) is an epidemiologic survey designed to monitor the prevalence of risky behaviors of adolescents in middle and high school1. The YRBSS is a complex sample survey with a three-stage cluster design. Multiple logistic regression is used to analyze the data, including methods of analysis to address issues in complex survey design. Results of this study indicate several different risk factors that influence the rate of suicidal ideation among adolescents, including alcohol and drug use, sexual risky behaviors, unhealthy weight loss methods, depressed mood, sex and race/ethnicity. The conclusions of this study indicate that many risk factors associated with suicidal ideation are behaviors that could be addressed with early intervention strategies to reduce the risk of suicidal ideation.
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31

Metzler, Anke [Verfasser], Marek [Akademischer Betreuer] Fuchs, and Mick P. [Akademischer Betreuer] Couper. "The effect of assigning sample members to their preferred device on nonresponse and measurement in Web surveys / Anke Metzler ; Marek Fuchs, Mick P. Couper." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1203801610/34.

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Metzler, Anke [Verfasser], Marek [Akademischer Betreuer] Fuchs, and Mick [Akademischer Betreuer] Couper. "The effect of assigning sample members to their preferred device on nonresponse and measurement in Web surveys / Anke Metzler ; Marek Fuchs, Mick P. Couper." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1203801610/34.

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33

Kan, Lai-fong Flora. "Teachers' in-service training needs in a sample of aided secondary schools in Hong Kong the implication for school administration /." Click to view the E-thesis via HKUTO, 1987. http://sunzi.lib.hku.hk/HKUTO/record/B38627243.

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34

Sorrell, Toni P. "TUNING OPTIMIZATION SOFTWARE PARAMETERS FOR MIXED INTEGER PROGRAMMING PROBLEMS." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/5035.

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The tuning of optimization software is of key interest to researchers solving mixed integer programming (MIP) problems. The efficiency of the optimization software can be greatly impacted by the solver’s parameter settings and the structure of the MIP. A designed experiment approach is used to fit a statistical model that would suggest settings of the parameters that provided the largest reduction in the primal integral metric. Tuning exemplars of six and 59 factors (parameters) of optimization software, experimentation takes place on three classes of MIPs: survivable fixed telecommunication network design, a formulation of the support vector machine with the ramp loss and L1-norm regularization, and node packing for coding theory graphs. This research presents and demonstrates a framework for tuning a portfolio of MIP instances to not only obtain good parameter settings used for future instances of the same class of MIPs, but to also gain insights into which parameters and interactions of parameters are significant for that class of MIPs. The framework is used for benchmarking of solvers with tuned parameters on a portfolio of instances. A group screening method provides a way to reduce the number of factors in a design and reduces the time it takes to perform the tuning process. Portfolio benchmarking provides performance information of optimization solvers on a class with instances of a similar structure.
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35

Kwok, Chi-yan Patrick, and 郭志仁. "Factors affecting the job satisfaction of a sample of vice-principals in aided secondary schools in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B31955678.

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36

Yau, Yuk-lin Bianca, and 邱玉蓮. "The careers of a sample of senior graduate masters and mistresses in Hong Kong aided secondary schools: implications for school administration." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B38626937.

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37

Wong, Sze Lo-sai, and 黃施露茜. "Problems encountered in school administration in a sample of new aidedsecondary schools in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B38626913.

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38

Hays, Mark A. "A Fault-Based Model of Fault Localization Techniques." UKnowledge, 2014. http://uknowledge.uky.edu/cs_etds/21.

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Every day, ordinary people depend on software working properly. We take it for granted; from banking software, to railroad switching software, to flight control software, to software that controls medical devices such as pacemakers or even gas pumps, our lives are touched by software that we expect to work. It is well known that the main technique/activity used to ensure the quality of software is testing. Often it is the only quality assurance activity undertaken, making it that much more important. In a typical experiment studying these techniques, a researcher will intentionally seed a fault (intentionally breaking the functionality of some source code) with the hopes that the automated techniques under study will be able to identify the fault's location in the source code. These faults are picked arbitrarily; there is potential for bias in the selection of the faults. Previous researchers have established an ontology for understanding or expressing this bias called fault size. This research captures the fault size ontology in the form of a probabilistic model. The results of applying this model to measure fault size suggest that many faults generated through program mutation (the systematic replacement of source code operators to create faults) are very large and easily found. Secondary measures generated in the assessment of the model suggest a new static analysis method, called testability, for predicting the likelihood that code will contain a fault in the future. While software testing researchers are not statisticians, they nonetheless make extensive use of statistics in their experiments to assess fault localization techniques. Researchers often select their statistical techniques without justification. This is a very worrisome situation because it can lead to incorrect conclusions about the significance of research. This research introduces an algorithm, MeansTest, which helps automate some aspects of the selection of appropriate statistical techniques. The results of an evaluation of MeansTest suggest that MeansTest performs well relative to its peers. This research then surveys recent work in software testing using MeansTest to evaluate the significance of researchers' work. The results of the survey indicate that software testing researchers are underreporting the significance of their work.
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39

Barahona, Jose L. "Maquiladoras in Central America: An Analysis of Workforce Schedule, Productivity and Fatigue." TopSCHOLAR®, 2019. https://digitalcommons.wku.edu/theses/3146.

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Textile factories or Maquiladoras are very abundant and predominant in Central American economies. However, they all do not have the same standardized work schedule or routines. Most of the Maquiladoras only follow schedules and regulations established by the current labor laws without taking into consideration many variables within their organization that could affect their overall performance. As a result, the purpose of the study is to analyze the current working structure of a textile Maquiladora and determine the most suitable schedule that will abide with the current working structure but also increase production levels, employee morale and decrease employee fatigue. A Maquiladora located in el Salvador, C.A. has been chosen for the study. It currently provides finished goods to one of the leading textile industries in the United States of America. The study will consist of collecting production numbers for two of their manufacturing cells for five consecutive days. In addition, a questionnaire will be administered to measure employee fatigue. Once all data have been collected, the data will be analyzed to determine the best working structure that will benefit the employee and the employer.
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40

Hong, Man-hoi Michael, and 康文海. "Staff development as perceived by a sample of Hong Kong Catholic secondary school teachers: implications forfuture staff development programmes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B31955666.

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41

Hill, David T. "The optical and NIR luminous energy output of the Universe : the creation and utilisation of a 9 waveband consistent sample of galaxies using UKIDSS and SDSS observations with the GAMA and MGC spectroscopic datasets." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1696.

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Theories of how galaxies form and evolve depend greatly on constraints provided by observations. However, when those observations come from different datasets, systematic offsets may occur. This causes difficulties measuring variations in parameters between filters. In this thesis I present the variation in total luminosity density with wavelength in the nearby Universe (z<0.1), produced from a consistent reanalysis of NIR and optical observations, taken from the MGC, UKIDSS and SDSS surveys. I derive luminosity distributions, best-fitting Schechter function parameterisations and total luminosity densities in ugrizYJHK, and compare the variation in luminosity density with cosmic star formation history (CSFH) and initial mass function (IMF) models. I examine the r band luminosity distribution produced using different aperture definitions, the joint luminosity- surface brightness (bivariate brightness) distribution in ugrizYJHK, comparing them to previously derived distributions, and how the total luminosity density varies with wavelength when surface brightness incompleteness is accounted for. I find the following results. (1) The total luminosity density calculated using a non-Sersic (e.g. Kron or Petrosian) aperture is underestimated by at least 15%, (2) Changing the detection threshold has a minor effect on the best-fitting Schecter parameters, but the choice of Kron or Petrosian apertures causes an offset between datasets, regardless of the filter used to define the source list, (3) The decision to use circular or elliptical apertures causes an offset in M* of 0.20 mag, and best-fitting Schechter parameters from total magnitude photometric systems have a flatter faint-end slope than Kron or Petrosian photometry, (4) There is no surface brightness distribution evolution with luminosity for luminous galaxies, but at fainter magnitudes the distribution broadens and the peak surface brightness dims. A Choloniewski function that is modified to account for this surface brightness evolution fits the bivariate-brightness distribution better than an unmodified Choloniewski function, (5) The energy density per unit interval, vf(v) derived using MGC and GAMA samples agrees within 90% confidence intervals, but does not agree with predictions using standard CSFH and IMF models. Possible improvements to the data and alterations to the theory are suggested.
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42

Brockett, Russell. "How Other Drivers’ Vehicle Characteristics Influence Your Driving Speed." Scholarship @ Claremont, 2011. http://scholarship.claremont.edu/cmc_theses/131.

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An analysis of the effect of passing vehicles’ characteristics and their impact on other drivers’ velocities was investigated. Three experimental studies were proposed and likely outcomes were discussed. Experiment 1 focused on the effect of passing vehicle type (SUV, sedan or truck) on driver speed. Drivers were hypothesized as going faster when the same vehicle type as they were driving passed them versus when no vehicle or a different vehicle passed them. Experiment 2 focused on the effect of passing SUV age on driver’s speed. Evidence suggests passing older SUVs will increase the driver’s speed more than new SUVs. Experiment 3 focused on the effect of passing SUV color on speed. Drivers were hypothesized to go faster when brighter colors (red and yellow) rather than cooler colors (grey and black) were painted on the vehicle.
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43

Kan, Lai-fong Flora, and 簡麗芳. "Teachers' in-service training needs in a sample of aided secondary schools in Hong Kong: the implication forschool administration." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B38627243.

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Wong, Chung-kee Steve. "An investigation of the administrative duties of a sample of senior teachers in Hong Kong secondary schools : the implications for the construction of an in-service training programme in school administration /." Hong Kong : University of Hong Kong, 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18493907.

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45

Ma, Lai-yin Agnes, and 馬麗妍. "Effects of match-to-sample cueing on the teaching of Chinese word reading to preschool children with mild learning difficulties." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B3195571X.

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46

Lorenc, Boris. "Two topics in survey methodology : modelling the response process in establishment surveys : inference from nonprobability samples using the double samples setup /." Stockholm : Department of Statistics, Stockholms University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1063.

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47

Wong, Chung-kee Steve, and 黃仲基. "An investigation of the administrative duties of a sample of senior teachers in Hong Kong secondary schools: theimplications for the construction of an in-service training programmein school administration." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1985. http://hub.hku.hk/bib/B31955526.

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48

Clifford, Dustin M. "Non-Conventional Approaches to Syntheses of Ferromagnetic Nanomaterials." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4205.

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The work of this dissertation is centered on two non-conventional synthetic approaches to ferromagnetic nanomaterials: high-throughput experimentation (HTE) (polyol process) and continuous flow (CF) synthesis (aqueous reduction and the polyol process). HTE was performed to investigate phase control between FexCo1-x and Co3-xFexOy. Exploration of synthesis limitations based on magnetic properties was achieved by reproducing Ms=210 emu/g. Morphological control of FexCo1-x alloy was achieved by formation of linear chains using an Hext. The final study of the FexCo1-x chains used DoE to determine factors to control FexCo1-x, diameter, crystallite size and morphology. [Ag] with [Metal] provide statistically significant control of crystallite size. [OH]/[Metal] predict 100 % FexCo1-x at > 30. To conclude section 1, a morphological study was performed on synthesis of Co3-xFexOy using the polyol process. Co3-xFexOy micropillars were synthesized at various sizes. The close proximity of the particles in the nanostructure produced an optical anisotropy and was magnetically induced which is evidence for the magneto-birefringence effect. The second non-conventional synthetic approach involves continuous flow (CF) chemistry. Co nanoparticles (Ms=125 emu/g) were newly synthesized by aqueous reduction in a microreactor and had 30 ±10 nm diameter and were produced at >1g/hr, a marker of industrial-scale up viability. The final work was the CF synthesis of FexCo1-x. The FexCo1-x was synthesized with limitation to the composition. The maximum FexCo1-x phase composition at 20 % resulted from the aqueous carrier solvent triggering oxide formation over FexCo1-x.
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49

Pierre, Herma. "Mangiferin as a Biomarker for Mango Anthracnose Resistance." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2247.

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Mangos (Mangifera indica L.) are tropical/subtropical fruits belonging to the plant family Anacardiaceae. Anthracnose is the most deleterious disease of mango both in the field and during postharvest handling. It is most commonly caused by the Colletotrichum gloeosporioides complex. Mangiferin, a xanthanoid compound found in at least twelve plant families worldwide (Luo et al., 2012), is present in large amounts of the leaves and edible mangos. Even though this compound plays a pivotal role in the plant’s defense against biotic and abiotic stressors, no correlations been made between the compound and mango anthracnose resistance. Mangos were collected, grouped according to their countries of origin, and evaluated for their mangiferin concentrations at four different stages of development. Extracts of interest were then tested against different strains of C. gloeosporioides. The results demonstrated that mangiferin concentrations are significantly different at different stages in fruit development. The antifungal assays were inconclusive.
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Blahut, Steven Albert. "Latent Class Logistic Regression with Complex Sample Survey Data." College Park, Maryland : University of Maryland, 2004. http://hdl.handle.net/1903/2000.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.
Thesis research directed by: Measurement, Statistics and Evaluation. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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