1.Find the genes that change expression
between experimental and control samples
2.Classify samples based on a gene
expression profile
3.Find patterns: Groups of biologically related genes that change expression together
across samples and
treatments
Allison DB et al. (2005) Microarray
data analysis: from disarray to consolidation and consensus
Nat Rev gene. 7: 55–65 doi:10.1038/nri1749