In Figure 5 we plot the first two eigenvectors. Notice that the population separation is clear, but that the natural separation axes are not the eigenvectors. Further, the Thai and Chinese populations appear to show a cline, rather than two discrete clusters grouped around a central point. We suspect that this shows some evidence of genetic admixture, perhaps involving a population in Thailand that is related to the Chinese. (See also Figure 8, which we describe later.) Table 2 shows the eigenvalues, the TW significance, and an ANOVA p-value for the first three eigenvectors. Again there is excellent agreement between the supervised and unsupervised analyses.
