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

"Interaction" refers generally to when the effect of an explanatory variable depends on the value of another explanatory variable. In the simplest case, in linear regression, that is analyzed by including the product between two variables as an additional predictor in the model. This implies that the slope of each variable depends on the value of the variable it is interacting with.

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