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Re: st: Plotting and testing of interaction effects (continuous variables)
From
William Buchanan <[email protected]>
To
[email protected]
Subject
Re: st: Plotting and testing of interaction effects (continuous variables)
Date
Thu, 4 Apr 2013 12:46:46 -0700
-h margins- and -h marginsplot- will point you in the right direction. Additionally, Michael Mitchell has a great book that specifically addresses this topic (http://statapress.com/books/interpreting-visualizing-regression-models/).
HTH,
Billy
On Apr 4, 2013, at 12:19 PM, Roman Wörner <[email protected]> wrote:
> Dear list members,
>
>
> I am fairly new to STATA and statistics in general - I'm thus very sorry in case my questions appear pretty basic to most of you.
>
>
> As part of my project I regress a performance variable (DV) on two explanatory variables, their interaction and a set of controls (IVs). Both explanatory variables (the interacted ones) are continuous. To allow for a better interpretation of the interaction many papers present simple slope graphs of the interactions (basically high/low combinations of the two variables) combined with significance tests of the slope of the one variable at the two levels of the other.
>
>
> I found "Cohen et al. (2003): Applied Multiple Regression/Correlation Analysis for the Behavioral Sciences" very helpful since they explain the math in Chapter 7 "Interactions Among Continuous Variables". So I think I should be able to do both the plotting and testing by hand. However, I was wondering if there is a (user written) STATA command available which could be used to create the plots as well as to do the significance tests.
>
> Many thanks
>
> Roman
>
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