Chunk #5 — Methods and results — Delineation of the problem

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Testing for measured gene-environment interaction: problems with the use of cross-product terms and a regression model reparameterization solution.

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Let us first assume that the genotype has two categories, 0 and 1, as follows: G=0has the relationP∣(G=0)=δ00+δ01EG=1has the relationP∣(G=1)=δ10+δ11E.