Figure 1
Comparison of the distributions of quality indices from the different ethnic groups based on the Affymetrix Human Mapping 500K Set. The subfigures in the diagonal show the names of ethnic groups (CEU, YRI, CHB, JPT, HapMap Asian, TWN, and TWN + HapMap). The subfigures in the lower diagonal part show the histograms and fitted curves of quality index Q2 for any two given ethnic groups. In each subfigure, distributions of quality indices from two ethnic groups are superimposed, with the purple bar and curve corresponding to the ethnic group named on the above, and the green bar and curve corresponding to the ethnic group named on the right. The subfigures in the upper diagonal part show the p-values for testing equality of means (in log scale), variances (in log scale) and sampling distributions for any two given ethnic groups, Pmean, Pvar and PKS. The names of the two ethnic groups compared are shown in the upper-left corner in each subfigure. P-values smaller than 0.05 are indicated in red.