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| From | "Fitzmaurice, Ann E." <a.e.fitzmaurice@abdn.ac.uk> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | st: RE: margins |
| Date | Tue, 10 May 2011 22:32:00 +0100 |
Hi Am trying to use margins in the following model Logistic preterm i.bir_grp*i.age_gr2a other categorical variables Bir_grp has 4 levels, and age_gp2a has 5 levels I get an error message "factor bir_grp not found in e(b)" Question , have I mis-specified the model and how can I get margins to give me the table Thanks Ann Ann E Fitzmaurice Medical Statistician Immpact University of Aberdeen Health Sciences Building Foresterhill Aberdeen, AB25 2ZD Scotland Tel: +44 (0)1224 553876 Fax: +44 (0)1224 555704 Email: a.e.fitzmaurice@abdn.ac.uk The University of Aberdeen is a charity registered in Scotland, No SC013683. * * 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/