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"Fitzmaurice, Ann E." <email@example.com>
Tue, 10 May 2011 22:24:54 +0100
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
Ann E Fitzmaurice
Immpact University of Aberdeen
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