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  1. Tux

    polynomial regression and interaction

    Hi, I have a question related to interaction in polynomial regression. So, suppose I have the following model: Y = aX1 + bX2 + c*X1^2 + d*X2^2 + e*X1*X2 + f*K + error, where f is a vector of coefficients, and K is a vector of variables that may have interaction terms between them. Now, as...