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Antwort: Re: st: Problems with defining varable interactions in ANOVA


From   Justina Fischer <JFischer@diw.de>
To   statalist@hsphsun2.harvard.edu
Subject   Antwort: Re: st: Problems with defining varable interactions in ANOVA
Date   Fri, 7 Jan 2011 15:46:20 +0100

.. use "##" , as you are also interested in estimating the non-interacted form
in addition

so

xi: reg y  c.a##c.b

will estimate the coefficients of a, b and a*b

(assuming a and b are continuous)

JF


-----owner-statalist@hsphsun2.harvard.edu schrieb: -----

An: statalist@hsphsun2.harvard.edu
Von: Richard Goldstein <richgold@ix.netcom.com>
Gesendet von: owner-statalist@hsphsun2.harvard.edu
Datum: 07.01.2011 02:15PM
Thema: Re: st: Problems with defining varable interactions in ANOVA

what Stata manuals are you talking about? the symbol should be "#", not
the asterisk you are using

Rich

On 1/7/11 7:52 AM, Rom Litwin wrote:
> Greetings,
>
> I am super-new to STATA. I am running STATA 11 in Win7 and - contrary to
> what most STATA manuals claim, it seems - I am unable to set up interaction
> variables in ANOVA. Just to use an example from the UCLA manual, when I run:
>
> . use http://www.ats.ucla.edu/stat/stata/faq/crf24
> . anova y a b a*b
>
> I am getting the following error:
> variable a*b not found
> r(111);
>
> Thank you for your advice.
>
> - Rom Litwin
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