Hi, Dear UCSC Genome Browser group,

I downloaded the table "snp132common" from the track "Common SNPs(132)".
In the filter, I choose "valid does include by-hapmap" only.

Here is the statistics shown by the browser.  The number of hapmap SNPs
is only half of what hapmap homepage provides (~ 4.2M).

Could you please explain why? Thanks

Xiang

----
Common SNPs(132) (snp132Common) Summary Statistics      
        
item count      2,040,597
item bases      2,044,103 (0.07%)
item total      2,044,159 (0.07%)
smallest item   0
average item    1
biggest item    88

  Region and Timing Statistics
        
region  genome
bases in region 3,137,161,264
bases in gaps   239,845,127
load time       71.71
calculation time        0.99
free memory time        0.00
filter  on
intersection    off



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