Figure 1.

Illustration of Monte Carlo method for examining significance of test statistic ln Λ for comparison of Australian (sample) and New Guinean (potential source) populations. Histogram of 1,000 values of the ln-probability difference generated by simulating genotypes given the allele counts observed for the Australian (sample) population. A total of 72 markers, for which the individual Australian 1 has been typed, were used to generate the distribution. See Eqs. 23–25. The critical region for the test statistic (α = 0.05) is that portion of the distribution to the left of the arrow. The posterior probability ratio (ln Λ = −2.76) for the individual Australian 1 is indicated by an asterisk.