TABLE 1

Simulated critical values for the likelihood-ratio test (LRT) of genic selection for different values of the selection parameter, sample size, and observed number of segregating sites

γnS95% critical
 valueFraction rejected
 assuming χ2Embedded Image
−4251003.540.04
1,0004.230.061
10,0004.060.056
501003.810.049
1,0004.040.054
10,0003.780.048
4251003.640.045
1,0003.890.052
10,0003.860.051
501003.780.048
1,0003.830.050
10,0004.150.065
20251003.860.051
1,0003.940.053
10,0003.420.033
501003.520.039
1,0003.910.051
10,0003.650.044
  • Asymptotic likelihood theory predicts that the 95% critical value is 3.84. Also shown is the null rejection rate at P = 0.05 under the asymptotic assumption that the LRT statistic is chi-square distributed.