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Comparison between R2 for ancestry inference using AIMs, random SNPs and genome-wide SNPs. Models were built with 112 CEU samples and 113 YRI samples and tested with 49 ASW samples. R2 was calculated with the predicted first PC and the gold standard, which is the first PC obtained by applying PCA to combined samples of CEU, YRI and ASW with 813 976 SNPs. The vertical bars represent 95% CIs
