Table 2.

Summary of block partitions and tag SNPs for the largest six data sets in dbSNP

Data set	Population	Number of genotypes	Number of SNPs	Number of individuals	Number of blocks	Number of tag SNPs	Avg. block length (kb)	Number tag SNPs per kb
HAPMAP	CEU	84,727,965	954,302	90	73,986	179,351	30.7	0.079
HAPMAP	HCB	18,443,054	411,568	45	41,381	94,583	40.2	0.057
HAPMAP	JPT	18,030,239	411,627	44	20,671	31,466	41.8	0.054
HAPMAP	YRI	38,661,518	431,505	90	67,111	157,287	21.5	0.109
PERLEGEN	Afr	35,568,060	1,569,392	23	235,139	569,182	9.1	0.267
PERLEGEN	Asi	37,417,872	1,572,384	24	86,636	211,972	26.9	0.090
PERLEGEN	Eur	37,399,120	1,570,560	24	109,212	274,153	21.8	0.115
Affymetrix	Afr	885,135	125,776	20	24,526	40,050	44.1	0.037
Affymetrix	Cau	1,534,726	125,778	20	27,561	47,957	37.2	0.047
Affymetrix	Asi	884,091	125,772	20	20,671	31,466	54.5	0.028
Affymetrix	CEPH	50	30	3	18,453	26,018	62.9	0.022
Affymetrix	PDpanel	2,869,641	125,776	24	35,048	67,154	26.11	0.073
Affymetrix	APE	15,823	9027	2	6253	6262	5.9	0.170
TSC	ALL	4,932,382	19,048	1963	31,886	46,789	21.8	0.075
EGP	ALL	3,184,170	37,737	90	3847	6643	2.9	0.590
PGA/UW	Afr	363,643	15,981	24	2833	5375	1.26	1.503
PGA/UW	Eur	209,551	9525	23	1086	2378	3.6	0.359

Inference and analysis of haplotypes from combined genotyping studies deposited in dbSNP