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From |
Fred Wolfe <fwolfe@arthritis-research.org> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: -margins- vs -adjust- |

Date |
Thu, 5 Nov 2009 04:22:10 -0600 |

Jeff's post and explanation was very helpful. I have been struggling with the manual on margins since Stata 11 came out. Sometime I think I understand it it, sometimes not. Perhaps Jeff could clarify this further for me. The manual states: A margin is a statistic based on a fitted model calculated over a dataset in which some of or all the covariates are fixed at values different from what they really are. For instance, after a linear regression fit on males and females, the marginal mean (margin of mean) for males is the predicted mean of the dependent variable, where every observation is treated as if it represents a male; thus those observations that in fact do represent males are included, as well as those observations that represent females. The marginal mean for female would be similarly obtained by treating all observations as if they represented females. A simple question, what does it mean (precisely) "...where every observation is treated as if it represents a male <snip> treating all observations as if they represented females." What actually is done so they are "treated as if?" Thanks, Fred -- Fred Wolfe National Data Bank for Rheumatic Diseases Wichita, Kansas NDB Office +1 316 263 2125 Ext 0 Research Office +1 316 686 9195 fwolfe@arthritis-research.org * * 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**:**Re: st: -margins- vs -adjust-***From:*jpitblado@stata.com (Jeff Pitblado, StataCorp LP)

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