Fig. 1
From: Integrating mean and variance heterogeneities to identify differentially expressed genes
Null joint distributions of the test statistics on mean and variance heterogeneities under normality setting. Each panels displays 100,000 pairs of the specified test statistics, which were computed from 100,000 replicates of two-group samples of sizes (n 1 = n 2 = 40) from the standard normal distribution. Panel a shows the null independence between Welch t statistic and Levene statistic. Panel b shows the null independence between Welch t-statistic and F-statistic. Panel c shows the equivalence between Welch t statistic and Student t statistic. Panel d shows the high correlation between Levene test statistic and Brown-Forsythe statistic