a=(1−ε−ε2εε2ε1−2εεε2ε1−ε−ε2) where ε~2−40 is chosen small enough to avoid short false positives. For the admixture determination of the region in between 34,500kb and 35,500kb (NCBI 36.3 coordinates), all 242 SNPs common to the two platforms for cases and controls were used.
