To compare the assignment probabilities of each individual between the SNPs and STRPs we took the absolute value of the differences between the probability generated by each set of SNPs and the one generated by the STRPs in each individual averaged across the individuals genotyped in both sets. We subtracted that number from one to obtain a measure of percent similarity between the SNP and STRP results. For example, assume that the probability of membership in groups 1 and 2 for a single individual in a SNP run is completely ambiguous (0.5 and 0.5, respectively). When this is compared with STRP probabilities of approximately 1 and 0; percent similarity for that individual would be calculated as, 1 - |1 - 0.5| = 0.5, or 50% similarity. This score implies a completely ambiguous assignment versus an absolute assignment and is the lowest expected score.
