Power of our statistics as compared to alternative approaches.

<p>(A) across a range of selection gradients () of latitude, and when we hold constant at 0.14 and (B) decrease , the genetic correlation between the trait of interest and the selected trait, (C) vary the number of loci, and (D) vary the number of loci while holding the fraction of variance explained constant. Bottom panels show power of the Z-test and approaches to detect selection affecting (E) a single population, and (F) multiple populations in a given region. See main text for simulation details.