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  • Modeling the Visibility Distribution for Respondent-driven Sampling with Application to Population Size Estimation

    Creator:
    McLaughlin, Katherine R., Johnston, Lisa G., Jakupi, Xhevat, Gexha-Bunjaku, Dafina, Deva, Edona, and Handcock, Mark S.
    Abstract:
    Respondent-driven sampling (RDS) is used throughout the world to estimate prevalence and population size for hidden populations. Although RDS is an effective method for enrolling people from key populations in studies, it relies on a partially unknown sampling mechanism, and thus each individual’s inclusion probability is unknown. Current estimators for...
    Resource Type:
    Article
    Full Text:
    respondent-driven sampling with application to population size estimation The Annals of Applied Statistics

  • Variable selection in semi-parametric models

    Creator:
    Jiang, Shuping
    Abstract:
    We consider two semiparametric regression models for data analysis, the stochastic additive model (SAM) for nonlinear time series data and the additive coefficient model (ACM) for randomly sampled data with nonparametric structure. We employ the SCAD-penalized polynomial spline estimation method for estimation and simultaneous variable selection in both models. It...
    Resource Type:
    Dissertation
    Full Text:
    OF THE DISSERTATION OF Shuping Jiang for the degree of Doctor of Philosophy in Statistics presented

  • Spatial graphical models with discrete and continuous components

    Creator:
    Che, Xuan
    Abstract:
    Graphical models use Markov properties to establish associations among dependent variables. To estimate spatial correlation and other parameters in graphical models, the conditional independences and joint probability distribution of the graph need to be specified. We can rely on Gaussian multivariate models to derive the joint distribution when all the...
    Resource Type:
    Dissertation
    Full Text:
    of Doctor of Philosophy in Statistics presented on August 16, 2012. Title: Spatial Graphical Models

  • Propensity score adjustments using covariates in observational studies

    Creator:
    Yang, Daniel K.
    Abstract:
    In this thesis we develop a theoretical framework for the identification of situations where the equal frequency (EF) or equal variance (EV) subclassification may produce lower bias and/or variance of the estimator. We conduct simulation studies to examine the EF and EV approaches under different types of model misspecification. We...
    Resource Type:
    Dissertation
    Full Text:
    ────────────────────────────────────────────────── Chair of the Department of Statistics ────────────────────────────────────────────────── Dean

  • Propensity score methodology for nonignorable nonresponse

    Creator:
    Starcevich, Leigh Ann H.
    Abstract:
    When data are not missing at random, approaches to reduce nonresponse bias include subsampling nonresponding units and modeling. The objective of this thesis is to develop unbiased and precise model-assisted estimators of the population total that are applicable to data from a complex survey design with nonignorable nonresponse. When information...
    Resource Type:
    Dissertation
    Full Text:
    , 2010. APRROVED: Major Professor, representing of Statistics Chair of the

  • Semiparametric marginal and mixed models for longitudinal data

    Creator:
    Tsai, Guei-Feng
    Abstract:
    This thesis consists of three papers which investigate marginal models, nonparametric approaches, generalized mixed effects models and variance components estimation in longitudinal data analysis. In the first paper, a new marginal approach is introduced for high-dimensional cell-cycle microarray data with no replicates. There are two kinds of correlation for cell-cycle...
    Resource Type:
    Dissertation
    Full Text:
    degree of Doctor of Philosophy in Statistics presented on August 29, 2005. Title: Semiparametric

  • Statistics in Education: Contributions to Teaching and Data Analysis

    Creator:
    Totty, Njesa
    Abstract:
    In this dissertation we present a compilation of the research conducted during the author’s doctoral program. In the first part, we discuss a case study regarding the impact of scholar-ships on student success at Oregon State University (OSU). Specifically, we look at the grad-uation and retention rates and aim to...
    Resource Type:
    Dissertation
    Full Text:
    statistics. The original sample statistic is marked by a solid line. This plot is returned as part of the

  • Kenward-Roger approximate F test for fixed effects in mixed linear models

    Creator:
    Alnosaier, Waseem S.
    Abstract:
    For data following a balanced mixed Anova model, the standard Anova method typically leads to exact F tests of the usual hypotheses about fixed effects. However, for most unbalanced designs with most hypotheses, the Anova method does not produce exact tests, and approximate methods are needed. One approach to approximate...
    Resource Type:
    Dissertation
    Full Text:
    -Major Professor, representing Statistics Chair of the Department of Statistics

  • Forms of Life: Goethe’s Impact on Twentieth-Century Anglophone Botany and Morphology

    Creator:
    Hahn, Andre M.
    Abstract:
    This dissertation examines the impact of the German naturalist and literary figure Johann Wolfgang von Goethe’s ideas on twentieth century Anglophone plant morphology and biology. Goethe interpreted the organ forms of flowering plants as metamorphoses of each other. His literary, historical, and philosophical writings suggest themes of alienation from and...
    Resource Type:
    Dissertation
    Full Text:
    Viewer results for “Plant Morphology.”…………………….. 65 3. Results of search for “morpho*” in Annals of

  • It's in the blood : the varieties of Linus Pauling's work on hemoglobin and sickle cell anemia

    Creator:
    Gormlet, Melinda (Melinda Brooke)
    Abstract:
    Linus Pauling incorporated hemoglobin and a disease of the blood, sickle cell anemia, into many of his researches between the mid-1930s and mid-1970s. In the early 1930s Pauling became interested in organic chemistry and named hemoglobin as one of the first biochemical substances that he planned to analyze. In 1935...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Melinda Gormley for the degree of