Analysis of the IBD data set using K = 2 for structure and ADMIXTURE and the first principal component from EIGENSTRAT. The plots shown are histograms of the first estimated ancestry parameter ( , or PC1) for the individuals, conditioned on self-reported ancestry. Only individuals self-reporting as Ashkenazi Jewish or northwestern European are shown. (A) ADMIXTURE; (B) structure; (C) EIGENSTRAT.