Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Complex survey"”.
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Statistical models for estimating the intake of nutrients and foods from complex survey data
… that lead to improvements in nutrition. These surveys often utilise complex sample designs for efficient data collection. There are several challenges in the statistical analysis of dietary intake data collected using complex survey designs, which have not been fully addressed by current …
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Methods For Constructing Confidence Intervals For Quantile Regression Coefficients
… arise in longitudinal, cluster, spatial, and complex survey designs. Results of a simulation study seem to indicate that they may have correct coverage and similar or sometimes narrower confidence intervals than the other methods considered.</p>
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Impact of Ignoring Nested Data Structures on Ability Estimation
… / Rasch model. The literature on the impact of complex survey design on latent trait models is mixed and there is no "best practice" established regarding how to handle this situation. A simulation study was conducted to address two questions related to ability estimation. First, what impacts …
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Análise de dados amostrais complexos utilizando redes neurais
… the selection of simple random samples for surveys is rarely used and more complex sampling schemes are used. The complex sampling schemes reflect complex structures from population. These structures of sampling scheme need to be incorporated when we fitting an ANN. In statistical …
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Techniques for Estimating the Variance of Specific Estimators within Complex Surveys
… statistics obtained from different types of survey designs, leading up to more advanced designs such complex surveys. The thesis starts with defining the various sampling designs that are to be used for illustrations (Ch 2). Chapter two gives further descriptions of how various sampling …
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Vitamin D, Calcium and Blood Pressure in the U.S.
… cycles of the National Health and Examination Survey (NHANES 2001-2006). Linear regression models were used to determine the adjusted association of 25(OH)D categories with blood pressure. An interaction term between 25(OH)D and calcium intake was fitted in the fully adjusted regression model. …
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Essays on Socio-Economic Integration of Migrants in the UK Labour Market: Access (or Lack of Access) to the Professional Class, Gendering of Occupations and Earning Trajectories
… panel data based on the world’s largest panel survey: UK Household Longitudinal Study (UKHLS), (data collected between 2009 and 2014). The first two essays are cross-sectional studies examining access (or lack of access) to the professional class and pay asymmetry of these groups, while, the …
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Implementation and evaluation of an IVR rendering platform for data collection in the developing world
… the United States, users were able to complete a complex survey with high accuracy. However, in a real-world deployment with teachers in rural Uganda lacking training or IVR experience, a number of significant interface modifications were required in order to achieve high success rates. The task …
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Statistical modeling of longitudinal survey data with binary outcomes
Data obtained from longitudinal surveys using complex multi-stage sampling designs contain cross-sectional dependencies among units caused by inherent hierarchies in the data, and within subject correlation arising due to repeated measurements. The statistical methods used for analyzing such data …
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Beta Drift: Forecasting the Manifold Relationships between Students and their Pursuit of STEM Careers
… age of 30</em> was examined across six years of complex survey data using multiple taxonometric definitions. Social Cognitive Career Theory provided the theoretical framework for defining relevant factors affecting this STEM pursuit construct. The findings from the study suggest that by varying …
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Beyond Parameter Estimation: Analysis of the Case-Cohort Design in Cox Models
… Ratio test (dLR), AIC (dAIC) and BIC (dBIC) in complex survey sampling are applied to case-cohort data and assessed in simulation studies. In the absence of sparse data, dLR is found to have similar power to robust Wald tests, with Type 1 error rate approximately 5%. In the presence of sparse …
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Relationship between Industry and Occupation with Cancer Using the Illinois BRFSS Survey (2018 to 2022)
… regression models were conducted, considering complex survey design and adjusting for demographic, socioeconomic, and lifestyle factors. A comprehensive case analysis was performed on a final sample of 10,503 individuals. In the results, the analysis showed no statistically significant increase …
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Vitamin D Supplementation Among Women of Childbearing Age: Prevalence and Disparities
… National Health And Nutrition Examination Survey (NHANES) dataset (2007-2008). We examined prevalence of vitamin D supplementation in stratified demographic (age, race/ethnic), socioeconomic (education, income, food security, health insurance, years in U.S.) and health (BMI, waist …
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Exploring risk-taking and health in immigrant adolescents to Canada: A unique focus on the “healthy immigrant effect”
… prevalence ratios while accounting for the complex survey design. Models were adjusted for age, family structure, and family support, while gender and ethnicity were examined as potential effect modifiers. Findings demonstrated an intergenerational gradient in substance use behaviours. …
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A Longitudinal Study of Alcohol and Drug Use in the Workplace
… estimation, taking the clustering effects of complex survey design into account, and (4) the hierarchical growth curve modeling of intra- and inter-individual differences. Using data from the National Longitudinal Survey of Youth 1979—1993, the 1997 National Household Survey on Drug Abuse, and …
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Economic Analysis Of Multidimensional Measures Of Obesity
… NHANES 1999-2004 database. To account for the complex survey design of the database, SAS-callable SUDAAN version 10 is used to conduct the analysis. The study sample includes respondents aged 20 and over, non-Hispanic persons who are examined, and women who are not pregnant. There are 2,736 …
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A Population-based Analysis of The Association Between Health Insurance Coverage And Psychological Distress And The Influence of Other Mediating Factors Among Young Adults In The United States
… were derived from the National Longitudinal Survey of Youth 97, conducted by the Bureau of Labor, Department of Commerce in 2008. Cross-sectional estimates were calculated using the SAS 9.2 statistical package to account for the complex survey design. Descriptive and inferential statistical …
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Access to Services, Quality of Care, and Family Impact for Caregivers of Children with Autism Spectrum Disorders: A National Perspective Using 2009-2010 Children with Special Health Care Needs (CSHCN) Survey
… study was conducted using the 2009-2010 National Survey of Children with Special Health Care Needs (N = 18,702). Chi-square analyses and logistic regressions were performed to examine the likelihood of reporting problems with access to services, quality of care, and family impact and compared …