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Beta calculation for SNPs in PLINK

Hi,

How is Beta calculated in PLINK, as I have three genotypes AA, AB, and BB of one SNP and I have the average of blood pressure of each genotype?

Thank you in advance

snp plink

1 answer

If I remember correctly, the beta is generated via linear regression, with the genotype coded as 0, 1 and 2. If there is no covariate, then the beta is basically obtained by

Phenotype ~ Genotype

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