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| 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 > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/