Figure 3

Accuracies of imputed genotypes in 59,000 SNPs (y axis) versus a summary of the LD patterns surrounding them (x axis). The summary of LD is a weighted average of the pairwise D' between each SNP to be imputed and all other SNPs in the same chromosome with weights that are calculated as $wD\text{'}={\displaystyle {\sum }_{i=1}^n{D}_i\text{'}}\exp (-d_i)$. In the formula, d _i is the physical distance between the SNP to be imputed and the ith SNP, in 100 kb, and d _i ' is the estimate of LD between the same two SNPs.