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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: AW: question for listserve |

Date |
Fri, 12 Jun 2009 15:55:23 +0200 |

<> " I have tried to do this with the suest command but I do not trust the results since the two regressions are not run on independent samples." Which part of the help file for -suest- suggests that you should have independent samples? It says that "The models may be estimated on different samples"... Would an interaction term between z and x3 not be a much simpler solution to your question? HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von scho0600@umn.edu Gesendet: Freitag, 12. Juni 2009 14:44 An: statalist@hsphsun2.harvard.edu Betreff: st: question for listserve I am trying to determine the statistical significance of the change in a parameter estimate for a predictor variable in a logistic regression when 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 part by x3. I have already determined that z is associated with x3 and that y is associated with x3. I have tried to do this with the suest command but I do not trust the results since the two regressions are not run on independent samples. I would be grateful for any guidance from anyone on how to perform a valid statistical test the change in the parameter estimate for z when x3 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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