Bayesian Model Averaging: Development of an Improved Multi-Class, Gene Selection and Classification Tool for Microarray Data
Technical rept. no. 468
WASHINGTON UNIV SEATTLE DEPT OF STATISTICS
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Accurate classification of samples using gene expression profiles is critically dependent on the method used to select relevant genes. We present the Bayesian Model Averaging BMA method for gene selection and classification of microarray data. Typical gene selection and classification procedures ignore model uncertainty and use a single set of relevant genes model to predict the class. BMA accounts for the uncertainty about the best set to choose by averaging over multiple models sets of potentially overlapping relevant genes. We showed that BMA selects smaller numbers of relevant genes compared to other methods and achieves high prediction accuracy on three microarray datasets. Our BMA algorithm is applicable to microarray datasets with any number of classes, and outputs posterior probabilities for the selected genes and models. Our selected models typically consist of only a few genes. The combination of high accuracy, small numbers of genes and posterior probabilities for the predictions, should make BMA a powerful tool for developing diagnostics from expression data.
- Genetic Engineering and Molecular Biology
- Medicine and Medical Research
- Statistics and Probability