Multiple hypothesis testing and clustering with mixtures of non-central t-distributions applied in microarray data analysis

M. T. Rodríguez Bernal

DES - Working Papers. Statistics and Econometrics. WS from Universidad Carlos III de Madrid. Departamento de Estadística

Abstract: Multiple testing analysis, based on clustering methodologies, is usually applied in Microarray Data Analysis for comparisons between pair of groups. In this paper, we generalize this methodology to deal with multiple comparisons among more than two groups obtained from microarray expressions of genes. Assuming normal data, we define a statistic which depends on sample means and sample variances, distributed as a non-central t-distribution. As we consider multiple comparisons among groups, a mixture of non-central t-distributions is derived. The estimation of the components of mixtures is obtained via a Bayesian approach, and the model is applied in a multiple comparison problem from a microarray experiment obtained from gorilla, bonobo and human cultured fibroblasts.

Keywords: Clustering; MCMC; computation; Microarray; analysis; Mixture; distributions; Multiple; hypothesis; testing; Non-central; t-distribution (search for similar items in EconPapers)
Date: 2010-11
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