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Filtering by: Creator Kellogg, Royal S. Remove constraint Creator: Kellogg, Royal S. Committee Member Madsen, Lisa Remove constraint Committee Member: Madsen, Lisa Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Estimation and modeling of selected forest metrics with lidar and Landsat

    Creator:
    Strunk, Jacob L.
    Abstract:
    Lidar is able to provide height and cover information which can be used to estimate selected forest attributes precisely. However, for users to evaluate whether the additional cost and complication associated with using Lidar merits adoption requires that the protocol to use lidar be thoroughly described and that a basis...
    Resource Type:
    Dissertation
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    large number of measurements from aerial photos are calibrated using a model(s) fitted to

  • Generalized linear mixed models with censored covariates

    Creator:
    Giovanini, John
    Abstract:
    This dissertation is about statistical methods for data analysis using generalized linear mixed models (GLMMs) with censored covariates. Special attention in given to the particular problem of inference about age-specific reproductive success in wild animal populations using some animals with known ages and some animals with ages only known to...
    Resource Type:
    Dissertation
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    to thank all the faculty, staff, and student s of the Oregon State University Statistics Department

  • Local Signal Detection on Irregular Domains with Spatially Varying Coefficient Model

    Creator:
    Zhang, Chengzhu
    Abstract:
    In areas such as spatial analysis and time series analysis, it is essential to understand and quantify spatial or temporal heterogeneity. In this dissertation, we focus on a spatially varying coefficient model, in which spatial heterogeneity is accommodated by allowing the regression coefficients to vary in a given spatial domain....
    Resource Type:
    Dissertation
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    (·)s are unknown bivariate varying coefficient functions. It is a flexible semi- parametric model, in

  • Navigating food and foes in the savanna : nutrition, infections and spatial ecology in African buffalo

    Creator:
    Combrink, Hendrik J.
    Abstract:
    The intricate relationship between wildlife health and the quality of their environment is well established, with technological advances increasing our understanding and aiding the unraveling of underlying mechanisms. Large herbivores require forage of sufficient quality to maintain their condition to reproduce and survive, all while warding off parasites and predators...
    Resource Type:
    Dissertation
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    endemic blood fluke, Schistosoma mattheei. Here, I show that resistance to S. mattheei is a heritable

  • Effects of Predator Introductions on Population and Community Dynamics

    Creator:
    Ingeman, Kurt E.
    Abstract:
    There is increasing awareness that human activities are altering the ways that natural systems operate and that local shifts in species composition and abundance can lead to abrupt and irreversible global change. Therefore, understanding the processes that buffer biological communities from critical shifts and how our actions affect natural stabilizing...
    Resource Type:
    Dissertation
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    documented off the coast of Florida in the 1980’s (Semmens et al. 2004), lionfish have undergone dramatic

  • Predator Conservation and Trophic Ecology

    Creator:
    Wolf, Christopher
    Abstract:
    Many of Earth’s terrestrial large carnivore species are threatened with extinction. As a result, some of the ecological effects associated with these species may be lost. With the goal of furthering large carnivore conservation research, I conduct three global scale analyses involving these species. First, I explore prey depletion as...
    Resource Type:
    Dissertation
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    ...........................................................................116 6.1 Values of ∑ 𝒚𝒊𝒏𝒊=𝟏 = 𝒔 for which the posterior distribution is proper (Type II

  • A Linear Mixed Model Framework for Spatio-Temporal Random Processes using the Separable and Product-Sum Covariance Structures

    Creator:
    Dumelle, Michael J.
    Abstract:
    We describe spatio-temporal random processes using linear mixed models and discuss estimation, inference, and prediction under this formulation. We show how many commonly used covariances are special cases of this more general framework and pay special attention to the separable and product-sum covariances. The linear mixed model formulation facilitates straightforward...
    Resource Type:
    Dissertation
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    time steps in seconds (s): 0 s, 75 s, 150 s, 225 s, 300 s, and 375 s. Black contour lines represent the

  • Regularization-Based Data Integration and Its Application to Genome-Wide Association Studies

    Creator:
    Li, Kai
    Abstract:
    In genome-wide association studies, it is often challenging to have consistent findings from independent studies. This "lack of reproducibility" issue is partially caused by the relatively small sample size compared to the number of genetic markers in every single study. Therefore, researchers have developed statistical methods to integrate multiple studies...
    Resource Type:
    Dissertation
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    coefficients for the eight relevant groups: α’s from the first dataset and β’s from the second dataset

  • 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
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    disjoint, non-empty subsets A,B,S of V, we say S separates A and B if every path in G between a node in A

  • Dynamic seascapes : a quantitative framework for scaling pelagic ecology and biogeochemistry

    Creator:
    Kavanaugh, Maria T.
    Abstract:
    Understanding and modeling microbial responses and feedbacks to climate change is hampered by a lack of a framework in the pelagic environment by which to link local mechanism to large scale patterns. Where terrestrial ecology draws from landscape theory and practice to address issues of scale, the pelagic seascape concept...
    Resource Type:
    Dissertation