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Re: st: interaction graph
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: interaction graph
Date
Sat, 22 Jan 2011 20:46:52 +0000
In principle, this is easy. Just generate predictions for dummy == 1
and dummy = 0 respectively and plot the curves on a graph of y vs x.
One convenience command that will do this for you is -regplot- from
-modeldiag-. You need to type something like
regplot x, separate(dummy)
after your regression command. Download -modeldiag- from
gr0009_1 from http://www.stata-journal.com/software/sj10-1
SJ10-1 gr0009_1. Update: Speaking Stata: Graphing model... / Update:
Speaking Stata: Graphing model diagnostics / by Nicholas J. Cox, Durham
University, UK / Support: [email protected] / After installation,
type help anovaplot, indexplot, / modeldiag, ofrtplot, ovfplot, qfrplot,
That is,
. search modeldiag
in an up-to-date and clickable links within the text above will be
visible. See also the article within SJ 4(4) 2004.
Nick
On Sat, Jan 22, 2011 at 6:16 PM, Fabio Zona <[email protected]> wrote:
> dear statalist,
>
> I have this model:
>
> Y = controls + X + X^2 + DUMMY + X*DUMMY + X^2 * DUMMY
>
> That is, a quadratic relation (X and X^2) is moderated by a dummy variable.
>
>
> I need to graph the two curves, to show the interaction effect. How can I do this in Stata?
>
> Thanks
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/