A random variance model for detection of differential gene expression in small microarray experiments - PubMed (original) (raw)

Comparative Study

. 2003 Dec 12;19(18):2448-55.

doi: 10.1093/bioinformatics/btg345.

Affiliations

Comparative Study

A random variance model for detection of differential gene expression in small microarray experiments

George W Wright et al. Bioinformatics. 2003.

Abstract

Motivation: Microarray techniques provide a valuable way of characterizing the molecular nature of disease. Unfortunately expense and limited specimen availability often lead to studies with small sample sizes. This makes accurate estimation of variability difficult, since variance estimates made on a gene by gene basis will have few degrees of freedom, and the assumption that all genes share equal variance is unlikely to be true.

Results: We propose a model by which the within gene variances are drawn from an inverse gamma distribution, whose parameters are estimated across all genes. This results in a test statistic that is a minor variation of those used in standard linear models. We demonstrate that the model assumptions are valid on experimental data, and that the model has more power than standard tests to pick up large changes in expression, while not increasing the rate of false positives.

Availability: This method is incorporated into BRB-ArrayTools version 3.0 (http://linus.nci.nih.gov/BRB-ArrayTools.html).

Supplementary material: ftp://linus.nci.nih.gov/pub/techreport/RVM\_supplement.pdf

PubMed Disclaimer

Similar articles

Cited by

Publication types

MeSH terms

LinkOut - more resources