Title page for ETD etd-08192006-115350


Type of Document Dissertation
Author Zhang, Huizi
URN etd-08192006-115350
Title Classification Analysis for Environmental Monitoring: Combining Information across Multiple Studies
Degree PhD
Department Statistics
Advisory Committee
Advisor Name Title
Smith, Eric P. Committee Chair
Boone, Edward Committee Member
Prins, Samantha C. Bates Committee Member
Ye, Keying Committee Member
Keywords
  • Environmental studies
  • Clustering
  • Hierarchical Model
  • Classification
Date of Defense 2006-08-14
Availability unrestricted
Abstract
Environmental studies often employ data collected over large spatial regions. Although it is convenient, the conventional single model approach may fail to accurately describe the relationships between variables. Two alternative modeling approaches are available: one applies separate models for different regions; the other applies hierarchical models. The separate modeling approach has two major difficulties: first, we often do not know the underlying clustering structure of the entire data; second, it usually ignores possible dependence among clusters. To deal with the first problem, we propose a model-based clustering method to partition the entire data into subgroups according to the empirical relationships between the response and the predictors. To deal with the second, we propose Bayesian hierarchical models. We illustrate the use of the Bayesian hierarchical model under two situations. First, we apply the hierarchical model based on the empirical clustering structure. Second, we integrate the model-based clustering result to help determine the clustering structure used in the hierarchical model. The nature of the problem is classification since the response is categorical rather than continuous and logistic regression models are used to model the relationship between variables.
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