TABLE 2

Mean Tajima's D and power with fixed S

N = 2000N = 3000N = 8000
sD coal (2 SE)Pow 2 (%)D coal (2 SE)Pow 2 (%)D coal (2 SE)Pow 2 (%)
S = 30
0.003–1.17 (0.01)33–1.31 (0.01)43–1.54 (0.01)58
0.005–1.33 (0.01)41–1.43 (0.01)50–1.68 (0.01)70
0.01–1.53 (0.01)57–1.66 (0.01)69–1.88 (0.01)86
0.015–1.60 (0.01)65–1.61 (0.01)65–1.42 (0.01)50
0.02–1.31 (0.01)42–1.20 (0.01)36–0.83 (0.01)19
0.03–0.71 (0.02)15–0.59 (0.02)12–0.34 (0.02)8
0.04–0.43 (0.02)9–0.36 (0.02)8–0.20 (0.02)5
S = 10
0.003–1.03 (0.01)27–1.17 (0.01)35–1.37 (0.01)47
0.005–1.19 (0.01)35–1.26 (0.01)40–1.49 (0.01)56
0.01–1.36 (0.01)46–1.47 (0.01)53–1.65 (0.01)68
0.015–1.40 (0.01)48–1.43 (0.01)50–1.26 (0.04)41
0.02–1.17 (0.01)34–1.06 (0.02)30–0.72 (0.02)17
0.03–0.65 (0.02)15–0.53 (0.02)13–0.31 (0.02)8
0.04–0.37 (0.02)9–0.31 (0.02)8–0.18 (0.02)6

The mean values of Tajima's D for different s values (two standard errors are shown below the means), based on simulations of the structured coalescent are shown. Pow 2 is the percentage of simulations that yielded values of D lower than the critical value (at the 95% probability level) obtained by coalescent simulations of the neutral model, as explained in simulation methods. The number of segregating sites, S, in the sample is fixed. U = 0.05.