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Re: st: interaction graph


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interaction graph
Date   Sun, 23 Jan 2011 14:07:56 +0000

Yes.

On Sat, Jan 22, 2011 at 8:56 PM, Fabio Zona <fabio.zona@unibocconi.it> wrote:
> Hi Nick,
> thanks! I will try this!
>
> But will this allow me to plot the two lines in the same graph, for comparison (such as those for interaction effects)?
>
>
>
>
> ----- Messaggio originale -----
> Da: "Nick Cox" <njcoxstata@gmail.com>
> A: statalist@hsphsun2.harvard.edu
> Inviato: Sabato, 22 gennaio 2011 21:46:52 GMT +01:00 Amsterdam/Berlino/Berna/Roma/Stoccolma/Vienna
> Oggetto: Re: st: interaction graph
>
> 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:  n.j.cox@durham.ac.uk / 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 <fabio.zona@unibocconi.it> 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
>>
>> *
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>> *   http://www.stata.com/support/statalist/faq
>> *   http://www.ats.ucla.edu/stat/stata/
>>
>
> *
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>
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