Figure 1
From: A factor model to analyze heterogeneity in gene expression
Structure of the illustrative data sets. Representation of three illustrative studies consisting of 1000 genes on 20 arrays divided between two groups. (A) Case 1: one independent grouping variable with red and green levels affecting all genes. (B) Case 2: one independent grouping variable with red and green levels affecting a gene set. (C) Case 3: two independent grouping variables with red and green levels and with blue and orange levels affecting each a different gene set.