Dissecting the statistic <i>f</i>_<i>4</i>(Altai Neanderthal, Biaka; Mbuti, Saharawi) belonging to the (archaic, African_<i>x</i>; African_<i>y</i>, non-African) class.

Sites were stratified by DAF in Africans or DAF in Europeans into three bins: nearly fixed ancestral (DAF < = 5%), non-fixed (DAF 5–95%), and nearly fixed derived (DAF > = 95%). This was done for unascertained data (all sites), for random ascertainment (AT/GC sites), and for four non-random ascertainment schemes as indicated in the leftmost column. The number and proportion of f4-informative sites falling into each DAF bin are shown. Mean DAF in four populations, mean differences in DAF between populations 1 and 2, populations 3 and 4, mean products of the DAF differences (i.e., f4-statistics) and their Z-scores are shown for these frequency bins. (XLSX)