Figure 2.
Accuracy of different algorithms as a function of the true number of populations. The demographic model is a star-shaped genealogy with populations having undergone equal amounts of drift. Subfigures A and C correspond to strong structure (F = 0.04) and B and D to weak structure (F = 0.01). (A and B) Compare the optimal model complexity estimated by the different algorithms using various metrics, averaged over 50 replicates, to the true number of populations represented in the data. Notably, when population structure is weak, both ADMIXTURE and fastSTRUCTURE fail to detect structure when the number of populations is too large. (C and D) Compare the accuracy of admixture proportions estimated by each algorithm at the optimal model complexity for each replicate.