Chunk #9 — 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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Collecting all these formulas we can find the one-to-one relation between δ and β coefficients: β0=δ00,δ00=β0,β1=δ10−δ00,δ01=β2,β2=δ01,δ10=β0+β1,β3=δ11−δ01,δ11=β2+β3.