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From |
Tim Wade <wadetj@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: standard error for estimated risk difference from logit model |

Date |
Fri, 4 Mar 2005 09:54:12 -0500 |

Joseph, thanks much-- I have tried the identity link and it does produce nearly identical results as the logit model, although the logit tends to fit the data *slightly* better. But I think the glm approach is a better way to go to get the ARs. Thanks, Tim On Fri, 04 Mar 2005 13:12:10 +0900, Joseph Coveney <jcoveney@bigplanet.com> wrote: > Tim Wade wrote: > > I have estimated probabilities for two groups (e.g., exposed and > unexposed) using the "adjust" command after a logistic regression, > holding several other covariates to their mean or other specified > values. The main exposure varies among individuals and is continuous. > I would like to estimate the risk difference for these each individual > (p_exposed-p_unexposed) and the confidence limit for this estimate. > P_unexposed is constant for all unexposed. The risk difference is no > problem, simply p_exposed-p_unexposed but I can't figure out how to > get the confidence limits or standard error. A partial line listing of > the predicted values follows, xse is the standard error of the linear > predictor (not of the probability). The only other option I could > think of would be to manually input the mean and other values get the > estimates and their ci's using predictnl. Does anyone have any other > suggestions? > > ---------------------------------------------------------------------------- > > Why not get them directly by changing the link function? > > Currently: -glm . . . , family(binomial) link(logit)- > > Recommendation: -glm . . . , family(binomial) link(identity)- > > Joseph Coveney > > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: standard error for estimated risk difference from logit model***From:*Joseph Coveney <jcoveney@bigplanet.com>

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