Interaction between two continuous variables - PsychWiki - A Collaborative Psychology Wiki

Interaction between two continuous variables - PsychWiki - A Collaborative Psychology Wiki: "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. 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."