FIG. 5.
Power to detect a locus undergoing recurrent directional selection. Shown is a comparison of the power of our popGenHMM as a function of the strength of selection, α = 2Nσ, in comparison with CLSW (Kim and Stephan 2002), SweepFinder (Nielsen et al. 2005), and a sliding window implementation of Tajima's D (Tajima 1989) to detect selection on a locus evolving according to the normal shift model. Each point consists of 1,000 samples drawn from forward population genetic simulations in which we simulated 20 kb from samples of size n = 50 with θ/bp = 0.01 and ρ/bp = 0.025. Selected sites occur in the middle fifth of the simulated locus (bases 8,000–12,000) and θ is constant across the entire region.