Distributions of the P values in different ISI comparisons by controlling the sample sizes (indicated by "n") of Gs and Gv transcripts to be the same as those of the Ga transcripts. One thousand times of re-sampling with replacement was performed for each transcript subgroup to derive the P value distributions. The P values were estimated by using the Mann-Whitney U test. The dashed line indicates P = 0.05 (or -log (P) = 1.301). "Fsig" indicates the fraction of P values in the distribution that is smaller than 0.05. The statistical significance between P value distributions of different transcript subgroups was estimated by using the Kolmogorov-Smirnov test and shown in the upper right corner of each panel.
Chen et al. BMC Evolutionary Biology 2011 11:192 doi:10.1186/1471-2148-11-192