Results for the principal components analysis (PCA) assessing the degree of stratification between the samples used for imputation and the four Hapmap populations. The two panels plot the top two principal components for CEU (Purple), YRI (Red), NNC (Black), NECS (Blue), AA (Orange), SCA (Green). The left panel shows that the African Americans (orange) are more admixed as compared to the SCA (green) in the right panel.
Zhao et al. BMC Genetics 2008 9:85 doi:10.1186/1471-2156-9-85