Relationship between the mean difference of distributions and d-value. Two datasets are generated from two distributions. Let N(0,1) and N(x, 1) be two normal distributions, where x is the mean difference between these two distributions. In this experiment, we consider x = 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, respectively. The d-value between two sets increases when the mean difference of two data sets increases.