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From |
John Antonakis <john.antonakis@unil.ch> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: question for listserve |

Date |
Fri, 12 Jun 2009 16:10:41 +0200 |

Hi:

ivprobit y = x1 x2 (z =x3), overid (download the -overid- ado) Then if you want to know whether the indirect effect is significant: nlcom [z]x3*[y]z

logit y z x1 x2 x3 x3*z Moderation occurs if the beta of the x3-z interaction is significant. HTH, J. ____________________________________________________ Prof. John Antonakis Associate Dean Faculty of Business and Economics University of Lausanne Internef #618 CH-1015 Lausanne-Dorigny Switzerland Tel ++41 (0)21 692-3438 Fax ++41 (0)21 692-3305 Faculty page: http://www.hec.unil.ch/people/jantonakis&cl=en Personal page: http://www.hec.unil.ch/jantonakis ____________________________________________________ On 12.06.2009 14:43, scho0600@umn.edu wrote:

I am trying to determine the statistical significance of the change ina parameter estimate for a predictor variable in a logistic regressionwhen another predictor is added In other words, I have two models;model 1: logit y on z x1 x2 model 2: logit y on z x1 x2 x3.I want to check if the association between y and z is mediated in partby x3. I have already determined that z is associated with x3 and thaty is associated with x3.I have tried to do this with the suest command but I do not trust theresults since the two regressions are not run on independent samples.I would be grateful for any guidance from anyone on how to perform avalid statistical test the change in the parameter estimate for z whenx3 is added to the regression.John T. Schousboe University of Minnesota * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/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/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: question for listserve***From:*scho0600@umn.edu

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