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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 19:22:36 +0200 |

I know it is not the best approach but I use tobit and probit regression models. In order to see the interaction effects it seems easier for me. ---------------------------------------- > From: dradwin@mprinc.com > To: statalist@hsphsun2.harvard.edu > Subject: RE: st: RE: Moderation effect by splitting the sample > Date: Fri, 21 Dec 2012 09:02:24 -0800 > > Ebru, > > Again, I don't think this is necessarily the best approach for your > situation, but amending Nick's code in > http://www.stata.com/statalist/archive/2012-12/msg00758.html , it would be > something like this: > > sysuse auto > su weight, detail > gen byte mysplit = cond(weight >= r(p75), 1, cond(weight <= r(p25), 0, .)) > > > 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: Friday, December 21, 2012 12:45 AM > > To: statalist@hsphsun2.harvard.edu > > Subject: RE: st: RE: Moderation effect by splitting the sample > > > > 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/ > * > * 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/

**References**:**st: Moderation effect by splitting the sample***From:*Ebru Ozturk <ebru_0512@hotmail.com>

**st: RE: Moderation effect by splitting the sample***From:*"David Radwin" <dradwin@mprinc.com>

**RE: st: RE: Moderation effect by splitting the sample***From:*Ebru Ozturk <ebru_0512@hotmail.com>

**RE: st: RE: Moderation effect by splitting the sample***From:*"David Radwin" <dradwin@mprinc.com>

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