Figure 8
From: Correlation test to assess low-level processing of high-density oligonucleotide microarray data
Correlations of the randomly sampled pairs of genes by percentage of present calls and mean intensity. The summary curves show the average correlation of the pairs of genes sampled from the breast cancer data. The differently colored curves correspond to the groups of absent/absent, absent/present and present/present pairs that have been defined in the text and are shown in Figure 6. Additionally, the pairs of genes have been arranged by their average mean intensity across chips: the range of average intensities was split into three intervals with an equal number of pairs, from the lowest third on the left to the highest third on the right. Grouping the pairs by their absence/presence status yields distinctly different patterns of correlations for RMA and MBEI, these patterns are however highly consistent between the intensities.