The number of differentially expressed genes identified depends on the data set size. For each sample size between 5 and 36, 32 random subsamples of patients were drawn from the total 37 patients data set. Box plots of the number of selected genes are plotted against the patient sample size. (A) Adapted sign test at significance level 2 × 10⁻⁴, (B) ratio-voting criterion withR ₀ = 3.5 and Φ = 0.3. The horizontal lines in the boxes represent lower and upper quartiles, and median. The lines extending from each end of the box show the extent of the rest of the data. (+) Outliers.