Chunk #8 — Methods and results — Delineation of the problem

Source

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

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Hence: δ10 = δ00 + β1; δ11 = δ01 + β3; and β1 = δ10 − δ00, β3 = δ11 − δ01.