that most imputed genotypes are called with a high degree of confidence (Supplementary Figure 1, Left Panel). For example, as measured by their quality scores, the top 95% of genotypes had average quality scores of 98.9% and actually matched experimental genotypes 98.6% of the time. Most of the errors affect a single allele so that, when measured on a per allele basis, concordance increases to 99.3%.
