If you want to compare the genotype frequency of cases with controls (HapMap) do you need the chrom. sample count or number of patients?

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Ken G Dodds

If you are comparing genotypes, then the sample size is the number of individuals (each individual has one genotype result).

Kumar Veerapen

Yes you would need the number of patients because each patient has a genotype. Based on your case-control number of genotypes, then genotype frequencies, you can then compare with that found on the HapMap.