Chunk #25 — RESULTS — DATA ANALYSIS OF POPRES

Source

Discovering genetic ancestry using spectral graph theory.

Embedded

yes

Text

We construct three scenarios from POPRES to illustrate the differences between PCA as implemented in the smartpca software [Patterson et al., 2006] and Spectral-GEM. For smartpca, by default any observation that exceeds 6 standard deviations in any of the top 10 eigenvectors is removed prior to the estimation of the ancestry vectors.