Figure 3

The mean values of 5-runs adjusted FOM calculations against the number of clusters. An open-source implementation of FOM provided by the Institute for Genomic Research (TIGR) [22] was used to calculate the adjusted FOM for k-means algorithm with Euclidean distance on normalised SAGE data. For a given tag, the abundance in each SAGE library was rescaled to make the sum of tag counts across all 14 libraries equal to one.