Fig. 2

ROC curves for group comparison tests. In SIM1, seven parametric methods and six rank-based methods are compared. (a): normal with small correlation; (b) normal with large correlation; (c): double exponential with small correlation; (d) double exponential with large correlation. AUC values are reported in the legend. Plot A is zoomed to facilitate the view of curves that overlay on top of each other. When curves are severely overlaid, line widths are slightly adjusted to improve readability. For both ρ=0.2 and ρ=0.8, the PB-transformed parametric and rank-based tests outperform all other tests