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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: FW: population attritutable risk fraction and xi in logistic regression |

Date |
Sat, 7 May 2011 16:14:35 +0100 |

The difficulty you had with -xi:- that "it did not like interactions" makes no sense; the whole point of -xi:- is to support interactions. Your specific difficulty can not be addressed if you do not show the code. The other difficulty with -aflogit- I cannot advise on, but everyone is asked to explain where user-written programs they use come from. In this case STB-42 sbe21 . Adjusted pop. attributable fractions from logistic regression (help aflogit if installed) . . . . . . . . . . . . . . . . . A. Brady 3/98 pp.8--12; STB Reprints Vol 7, pp.137--143 estimation of the attributable fraction (AF) from within a logistic regression framework, thus enabling confounders to be taken into account, and allows estimation of the summary AF for a set of exposures Nick On Sat, May 7, 2011 at 3:13 PM, Fitzmaurice, Ann E. <a.e.fitzmaurice@abdn.ac.uk> wrote: > I would like to calculate the PAFR after logistic regression with and without interactions of the form- > > Logistic dependent var1 list of variables var1*each of the variables in the list using xi > > Var1 has four groups , and this is where I think the problem may be > > The first problem got was that the use of xi did not like interactions (do not understand why), so I removed the interactions, but using aflogit, this couldn't find var1 > > This is the command I used > > aflogit bir_grp2, cc > > can anyone explain how to get this fraction from the adjusted model , can it be calculated in stata or by hand and if so does anyone have an example that I can follow > * * 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/

**Follow-Ups**:**RE: st: FW: population attritutable risk fraction and xi in logistic regression***From:*"Fitzmaurice, Ann E." <a.e.fitzmaurice@abdn.ac.uk>

**References**:**st: FW: population attritutable risk fraction and xi in logistic regression***From:*"Fitzmaurice, Ann E." <a.e.fitzmaurice@abdn.ac.uk>

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