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From |
Steve Samuels <sjsamuels@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Testing equality of odds ratios outside of logistic regression |

Date |
Sun, 9 May 2010 20:16:41 -0400 |

You can use -logistic- and test the interactions or -cc- with a test for homogeneity ***************** use http://www.stata-press.com/data/r11/bdesop, clear des gen tobac20 = tobacco <=2 xi: logistic case i.tobac20*i.alcohol [fw=freq] testparm _ItobXa* cc case tobac20 [fw=freq], by(alcohol) bd ********************** or On Sun, May 9, 2010 at 7:49 PM, Michael I. Lichter <MLichter@buffalo.edu> wrote: > I'm assisting on a paper where we examine the relationship between each of > four dichotomous predictors variables and one dichotomous outcome variable. > Prediction is our primary objective. The predictors are all measures of more > or less the same thing, and we want to know whether, *without controlling > for any of the others*, they predict the outcome equally well. We want to be > able to say, "If you could only pick one of these variables as a predictor > of the outcome, it wouldn't make any difference which one you selected." > > For each of the predictors we calculate a odds ratio and a corresponding > confidence interval. The odds ratios are very similar in magnitude and have > confidence intervals that overlap almost entirely. We did not do any formal > tests, not knowing of any offhand, and, because this isn't a central point, > we didn't think it was very important. When we reported that the odds ratios > were essentially equal, a reviewer objected that we had not tested for > equality. Any suggestions? > > In logistic regression, by the way, two of the four variables emerged as > significant predictors and two did not, controlling for the others. That is > of interest, but it doesn't answer my initial question. At least, I don't > think it does. > * > * 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/ > -- Steven Samuels sjsamuels@gmail.com 18 Cantine's Island Saugerties NY 12477 USA Voice: 845-246-0774 Fax: 206-202-4783 * * 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: Testing equality of odds ratios outside of logistic regression***From:*Steve Samuels <sjsamuels@gmail.com>

**References**:**st: Testing equality of odds ratios outside of logistic regression***From:*"Michael I. Lichter" <MLichter@Buffalo.EDU>

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