Fig. 5

Power of a test of independence based on different coefficient of correlations. The two columns of plots are respectively for estimates of Spearman’s ρ and Kendall’s τ, the rows correspond to different scenarios described with equations on the right. Equal samples of size n=20 are drawn from five groups from a Clayton distribution with correlation ρ _i . The null hypothesis is H ₀:ρ ₁=0. The power is simulated with 1000 repetitions on 51 different values of ρ ₁ to yield a curve that is then smoothed