Dynamic Supervised Principal Component Analysis for Classification
Publisher
The University of Arizona.Rights
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.Abstract
Contemporary research places great importance on high-dimensional classification, with dynamic classification problems being of particular interest. Such problems involve situations where the distributions of both classes are not static and change with time or other index variables. This paper proposes a new framework in the context of linear discriminant analysis (LDA) for learning classification decision rules that can adapt to changes with respect to the index variable. Furthermore, many existing works on high-dimensional classification problems make the sparsity assumption about the original feature space, which may not hold in practice. Our framework relaxes this assumption by learning the hidden sparse structure of the data through data rotation. In this work, we propose a new dimension reduction method in the context of dynamic problems. The new method employs a kernel smoothing procedure to determine the suitable direction for dimension reduction. Numerical simulations and real data examples are illustrated to demonstrate the performance of the new approach in terms of both classification accuracy and computational efficiency. One extension to solve non-normal data problems is also included.Type
Electronic Dissertationtext
Degree Name
Ph.D.Degree Level
doctoralDegree Program
Graduate CollegeStatistics