Block-diagonal discriminant analysis and its bias-corrected rules

Pang Herbert, Tong Tiejun () and Ng Michael
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Pang Herbert: Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, NC 27710, USA
Tong Tiejun: Department of Mathematics, Hong Kong Baptist University, Hong Kong
Ng Michael: Department of Mathematics, Hong Kong Baptist University, Hong Kong

Statistical Applications in Genetics and Molecular Biology, 2013, vol. 12, issue 3, 347-359

Abstract: High-throughput expression profiling allows simultaneous measure of tens of thousands of genes at once. These data have motivated the development of reliable biomarkers for disease subtypes identification and diagnosis. Many methods have been developed in the literature for analyzing these data, such as diagonal discriminant analysis, support vector machines, and k-nearest neighbor methods. The diagonal discriminant methods have been shown to perform well for high-dimensional data with small sample sizes. Despite its popularity, the independence assumption is unlikely to be true in practice. Recently, a gene module based linear discriminant analysis strategy has been proposed by utilizing the correlation among genes in discriminant analysis. However, the approach can be underpowered when the samples of the two classes are unbalanced. In this paper, we propose to correct the biases in the discriminant scores of block-diagonal discriminant analysis. In simulation studies, our proposed method outperforms other approaches in various settings. We also illustrate our proposed discriminant analysis method for analyzing microarray data studies.

Keywords: bias-correction; block-diagonal; classification; high-dimensional data; linear discriminant analysis (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1515/sagmb-2012-0017

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