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From | "Martin Weiss" <martin.weiss1@gmx.de> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | RE: st: AW: difference in odds ratio |
Date | Tue, 2 Mar 2010 20:23:21 +0100 |
<> Works just fine for me: ******* webuse union, clear clogit union age grade not_smsa if black, group(idcode) est sto A clogit union age grade not_smsa if !black, group(idcode) est sto B suest A B test [A_union=B_union], cons lincom [A_union]:age-[B_union]:age lincom [A_union]:grade-[B_union]:grade lincom [A_union]:not_smsa-[B_union]:not_smsa ******* HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Shehzad Ali Sent: Dienstag, 2. März 2010 19:11 To: statalist@hsphsun2.harvard.edu Subject: Re: st: AW: difference in odds ratio Thanks, Martin. For some strange reason, I experience the following problem: clogit chosen x1 x2 x3 x4 if sex==1, group(choice_set) est stor A clogit chosen x1 x2 x3 x4 if sex==0, group(choice_set) est stor B suest A B test [A=B], cons Error message: 'equation A not found' Interestingly, -suest- displays the results as equations 'A_chosen' and 'B_chosen'. I then tried using -test [A_chosen=B_chosen]- but the results look strange, i.e. differences for all pairs of coefficients are zero, which they shouldnt be. I wonder what I am doing wrong here? Also, is it possible to get the confidence interval of the difference between each set of coefficients from the two models? Thank you, Shehzad ----- Original Message ---- > From: Martin Weiss <martin.weiss1@gmx.de> > To: statalist@hsphsun2.harvard.edu > Sent: Tue, March 2, 2010 10:42:13 AM > Subject: st: AW: difference in odds ratio > > > <> > > > > ************* > h suest > ************* > > > > HTH > Martin > > > -----Ursprüngliche Nachricht----- > Von: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Shehzad Ali > Gesendet: Dienstag, 2. März 2010 11:32 > An: Stata List > Betreff: st: difference in odds ratio > > Hi listers, > > I have run two separate logistic regression models for two age groups > (dependent and independent variables are the same in the two regressions). I > want to find out whether the odds ratios for the two groups are > statistically significantly different from each other, i.e. I am interested > in OR(A) - OR(B) and the confidence interval around the difference. > > Could anyone suggest the best way to get the confidence interval and p-value > of the difference in odds ratios? > > Many thanks, > Shehzad > > > > > * > * 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/ * * 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/