Interaction between categorical and continuous variables

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Hi, I am your File:Guide6.pngDoug Stenstrom
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Testing interactions between categorical and continuous variables follows the same basic steps as testing interactions between two continuous variables so there is content overlap between this page and the page describing interactions between two continuous variables.


Two approaches are described below:
(1) three steps to conduct the interaction using commands within SPSS, and
(2) Interaction! software by Daniel S. Soper that performs statistical analysis and graphics for interactions between dichotomous, categorical, and continuous variables.

*For a description of what is an interaction and main effects, please see the accompanying page about What is an Interaction?.


Contents


Three Steps using SPSS

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

Center the continuous variable


Create the interaction term


Conduct Regression



Interaction! software






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