Calculating concordance (P0) and IQS from imputed genotype probabilities and actual genotypes.

The table was created by summing over probabilities for all N individuals (n = 1 to N) in each cell with pij_n representing the probability that the nth individual has the imputed genotype i and actual genotype j, where 1 corresponds to AA, 2 corresponds to AB, and 3 corresponds to BB. N1 = number of individuals with AA actual genotype, N2 = number of individuals with AB actual genotype, N3 = number of individuals with BB actual genotype, and N = number of total individuals.