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Figure 4 | BMC Bioinformatics

Figure 4

From: Visualization methods for statistical analysis of microarray clusters

Figure 4

Difference display visualization. Three clusters displayed traditionally on the left and in our difference image visualization on the right. In the difference display, the large top bar on each cluster shows the cluster average, each gene is displayed as its difference from that average (green indicates expressed less than the cluster average, red shows more expressed, and black means equally expressed with the cluster average). Cluster (a) is a coherent cluster of genes and appears very dark because of its homogeneity. Cluster (b) is another dark, uniform cluster, but it also contains one randomly inserted gene, which can be easily identified in our difference display. Cluster (c) contains a random selection of genes, and its randomness is clear from the brightness of the difference display. This difference display allows for quick assessment of overall cluster homogeneity and facilitates quick outlier detection. (Data and clusters a & b from [19])

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