Multiple linear regression of the difference (Δ) between self-perceived and genetically estimated ancestry for the three continental components.

NOTE: Δ refers to self-perception (bands 1 to 5, see Methods) minus continental ancestry proportions (0–100%) estimated from the genetic data. Sex and country of sampling were incorporated in the analyses as factors while the other variables were treated as quantitative. For ease of interpretation, the regression coefficient and p-value for Δ AMERICA (*) refer to Native American (not European) ancestry.Multiple linear regression of the difference (Δ) between self-perceived and genetically estimated ancestry for the three continental components.