Interaction between two continuous variables

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<div style="position: relative; top: -17px; left: 4px;"><table border=1 width=100%><td><table align=left><td></td></table></td><td><table cellpadding=2 align=right border=0 style="background-color: #FFFFFF; border-bottom: 1px #A0A0A0 outset; border-left: 1px #A0A0A0 solid; border-right: 1px #A0A0A0 solid;"><td>Hi, I am your <span style="text-color:#C0C0C0;background-color:#FFD700;padding:1px">guide</span>, [[Doug Stenstrom]]<br><center><sub>What is a "Guide"?</sub><br><sup>Where can I go if I have a question?</sup></center></td></table></td></table></div>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:<br>
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<div style="position: relative; top: -17px; left: 5px;"><table width=100%><td><table align=left><td></td></table></td><td><table cellpadding=2 align=right border=0 style="background-color: #FFFFFF; border-bottom: 1px #A0A0A0 outset; border-left: 1px #A0A0A0 solid; border-right: 1px #A0A0A0 solid;"><td>Hi, I am your <span style="text-color:#C0C0C0;background-color:#FFD700;padding:1px">guide</span>, [[Doug Stenstrom]]<br><center><sub>What is a "Guide"?</sub><br><sup>Where can I go if I have a question?</sup></center></td></table></td></table></div>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:<br>
(1) '''[[#Three Steps Using SPSS | three steps to conduct the interaction using commands within SPSS]]''', and<br>
(1) '''[[#Three Steps Using SPSS | three steps to conduct the interaction using commands within SPSS]]''', and<br>
(2) '''[[#Interaction! software | Interaction! software]]''' by Daniel S. Soper that performs statistical analysis and graphics for interactions between dichotomous, categorical, and continuous variables.
(2) '''[[#Interaction! software | Interaction! software]]''' by Daniel S. Soper that performs statistical analysis and graphics for interactions between dichotomous, categorical, and continuous variables.

Revision as of 07:13, 5 July 2007

Hi, I am your guide, Doug Stenstrom
What is a "Guide"?
Where can I go if I have a question?
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.

*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 two continuous variables


Create the interaction term


Conduct Regression



Interaction! software






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