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RE: st: RE: Moderation effect by splitting the sample


From   Ebru Ozturk <ebru_0512@hotmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Moderation effect by splitting the sample
Date   Fri, 21 Dec 2012 10:45:29 +0200

David, thank you. Can you also give the Stata commands for comparing upper and lower quartiles?

Kind regards
Ebru

----------------------------------------
> From: dradwin@mprinc.com
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: Moderation effect by splitting the sample
> Date: Thu, 20 Dec 2012 11:50:45 -0800
>
> Ebru,
>
> I can't say for sure without knowing more about what you are trying to do,
> but regarding splitting continuous variables, see this post and the
> references therein:
>
> http://www.stata.com/statalist/archive/2011-03/msg00154.html
>
> If you do split the variable anyway, consider comparing upper and lower
> terciles or quartiles (and not the upper and lower halves as a previous
> email intimated) to minimize loss of efficiency:
>
> Gelman, A., & Park, D. K. (2009). Splitting a predictor at the upper
> quarter or third and the lower quarter or third. The American
> Statistician, 63(1), 1-8.
> http://www.stat.columbia.edu/~gelman/research/published/thirds5.pdf
>
> David
> --
> David Radwin
> Senior Research Associate
> MPR Associates, Inc.
> 2150 Shattuck Ave., Suite 800
> Berkeley, CA 94704
> Phone: 510-849-4942
> Fax: 510-849-0794
>
> www.mprinc.com
>
>
> > -----Original Message-----
> > From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> > statalist@hsphsun2.harvard.edu] On Behalf Of Ebru Ozturk
> > Sent: Thursday, December 20, 2012 11:42 AM
> > To: statalist@hsphsun2.harvard.edu
> > Subject: st: Moderation effect by splitting the sample
> >
> >
> > Dear All,
> >
> > For non-linear models, I want to test the moderation effect of X
> variable.
> > Can I test this moderation effect by spliting the sample according to X
> > variable (moderator)?
> >
> > Kind regards
> > Ebru
>
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