2003 | OriginalPaper | Buchkapitel
POE: Statistical Methods for Qualitative Analysis of Gene Expression
verfasst von : Elizabeth S. Garrett, Giovanni Parmigiani
Erschienen in: The Analysis of Gene Expression Data
Verlag: Springer New York
Enthalten in: Professional Book Archive
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In many gene expression studies, the goals include discovery of novel biological classes and identification of genes whose expression can reliably be associated with these classes. Here we present a statistical analysis approach to facilitate both of these goals. The key idea is to model gene expression using latent categories that can be interpreted as a gene being turned “on“ or “off“ compared to a baseline level of expression. This three-way categorization is used for defining a reference in the unsupervised setting, for removing noise prior to clustering, for defining molecular subclasses in a way that is portable across platforms, and for defining easily interpretable probability-based distance measures for visualization, mining, and clustering.