Fig. 4.

Empirical study of the association between clusters and biological function. For every cluster identified by gamma ranking (red) or mclust (green) in the data sets in Table 2, plotted is the proportion of small enrichment p-values (vertical) versus the cluster size (horizontal). The enrichment p-values are Fisher-exact-test p-values and the proportion is computed over a database of GO and KEGG pathways (Table 7). Bands indicate similar proportions computed for random sets.