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st: margins
From
"Fitzmaurice, Ann E." <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: margins
Date
Tue, 10 May 2011 22:24:54 +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: [email protected]
The University of Aberdeen is a charity registered in Scotland, No SC013683.
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