An interaction term in a multiple regression model may be used when the relationship between X1 and Y changes for differing values of X2.

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An interaction term in a multiple regression model allows for the examination of how the relationship between one independent variable (X1) and the dependent variable (Y) changes across different levels of another independent variable (X2), indicating that the effect of X1 on Y is not constant but varies with X2.

An Interaction Term in a Multiple Regression Model May Be