Figure 1

Densities of the test scores in the analyses of the HapMap data. On the left hand side, the histograms and the estimated densities (marked by red lines) of the values of Pearson's χ²-statistic of the SNPs from the two subsets of the HapMap data (upper panel: JPT vs. CHB, lower panel: all four HapMap populations) are shown. The cyan line marks the estimated density when the inner knots are centered around the median in the natural cubic spline used in the density estimation. On the right hand side, the estimated densities (again, marked by red lines) and the corresponding null densities (black lines) are displayed.