Interaction between two continuous variables

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Statistical programs, like SPSS, do not always have "point-and-click" commands for every possible statistical test. This page is a description of how to test the interaction between two continuous variables. Below, an explanation of interactions is presented, then the three steps to conduct the interaction is described, and examples are given to help in understanding the steps involved.

Contents

What is an interaction?


Three Steps

There are three steps involved to calculate the interaction between two continuous variables.

Center the two continuous variables

Create the interaction term

Conduct Regression

Plotting the interaction

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