Boxplot of the Ratio of Naive-MVN eGene p Values to Permutation-Test eGene p Values
Using different sample sizes (n = 70, 110, 144, 220, and 300), we measured eGene p values of the two approaches with 1 M permutations and 1 M samplings on 100 probes and computed the ratio of eGene p values between the two methods. A distribution of the ratio on 100 probes is plotted. We excluded outliers with very significant p values to minimize sampling errors in our estimates. Blue shading denotes 90% accuracy.