Relationship between and the proportion of genetic variation explained by the first two components of the PCA.

<p>Both the main analyses of the paper in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1002886#pgen-1002886-t002" target="_blank">Table 2</a> and the supplementary analyses of Sub-Saharan Africa, in which certain populations excluded from the main analysis are included, are considered in obtaining the regression line. The values on the x-axis were obtained by summing the proportions of variance explained by PC1 and PC2 (columns 2 and 3 in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1002886#pgen-1002886-t002" target="_blank">Table 2</a>, columns 6 and 7 in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1002886#pgen.1002886.s016" target="_blank">Table S7</a>). values were estimated from the same datasets as used in the PCA (column 7 in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1002886#pgen-1002886-t002" target="_blank">Table 2</a>, column 11 in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1002886#pgen.1002886.s016" target="_blank">Table S7</a>). The dashed line indicates the linear least squares fit of . The Pearson correlation is .