Figure 4From: Comparative evaluation of set-level techniques in predictive classification of gene expression samplesHistograms of differential gene expression. Histograms of differential gene expression suggest the difficulty of the individual domains. An easy domain is supposed to have a strongly left-skewed histogram, while the difficult domains rather show a flat histogram. There is one plot for each of 30 domains, x axis shows the p-value of differential expression, the y axis gene frequency.Back to article page