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A situation where the effect of an explanatory variable may depend on the value of another explanatory variable.

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Quadratic moderator with a quadratic independent variable

Y = f(x1, x1^2, x2, x2^2, m1, m1^2, m2, m2^2) I need to include the interaction term. … Can I just take the interaction between the linear term of the independent variables and the moderators, i.e., x1m1, x1m2, x2m1, x2m2? …
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