Table 1. Genotyping error before and after imputation.

Sample ID	# of SNP affected	Ave. # of probe affected/SNP	Error Rate Before Imputation	Error Rate After Imputation
NA12812	20075	5.67	2.54%	0.45%
NA10835	20925	3.76	1.56%	0.32%
NA12239	12758	3.34	1.05%	0.26%
NA12144	7330	3.22	0.95%	0.24%
NA12005	4404	3.01	0.83%	0.65%
NA12056	7490	3.28	0.87%	0.85%
NA12146	7657	3.16	0.73%	0.25%
NA12155	9394	3.18	0.71%	0.71%
NA07056	2026	2.94	0.70%	0.54%
NA12236	8071	3.19	0.66%	0.65%
NA12813	4788	3.15	0.61%	0.25%
NA10863	5050	3.07	0.56%	0.55%