Additive Genotype Coding as Allele Dosage 0 1 and 2

The bridge from a genotype to a number in a regression. Without it the per-allele effect size is opaque.

Questions this Concept answers

Why does additive coding use 0, 1, and 2 rather than three unordered category labels?

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Genotype Coding — Statistical backgrounds for genetics trainees

This primer explains how DNA genotype calls are converted into the numbers a statistical model can use. It defines the additive coding model, in which each genotype becomes a count of alternative all…