Figure 4

Clustering of 60 arrays representing 20 tumors on 3 platforms. The figure shows the result of clustering the PCF estimated log ratios of 3 × 20 arrays obtained from the 3 platforms used on the 20 tumor samples (for PCF vector calculation see Methods). The samples were clustered using Spearman correlation and average linkage (A = Agilent 44 k, R = ROMA/NimbleGen 82 k, or I = Illumina 109 k). For 14 of the 20 tumors, the three platforms are clustered together at the lowest possible cluster level, for 4 of the remaining tumors, Illumina and ROMA/NimbleGen are clustered together.