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Examining secretor status

The SNP rs601338 at chr19:48,703,417 in FUT2 determines whether an individual secrets the Lewis antigen. An individual who is homozygous AA doesn't secret Lewis antigen ("non-secretors"), and everything else does ("secretors"). We have provided a file (GGVP/GGVP_secretor_status.txt) that includes the real secretor status for these individuals.

Question. How accurate is the secretor status called from imputation, in comparison to the real data provided?