Figure 5
From: Correlation test to assess low-level processing of high-density oligonucleotide microarray data
Percentage of Affymetrix present calls across all chips for all three data sets. For each probe set, the percentage of present calls across all chips in its data set was calculated. The histograms show the frequencies of these percentages. For each data set, about 30% of all probes are absent on all chips, and between 20 and 30% are present on all chips, with the balance equally distributed between the extremes.