st: Change reference group in logistic regression

[Morten Støver <morten.stover@ntnu.no>]

I want to change reference group doing a logistic regression.analysis on 
highest level of education and future work disability. The data is coded 
1=primary, 2 =secondary and 3=tertiary, and I would like tertiary to be 
the reference group. I've done this in cox regression using char and 
[omit], but I can't get this to work in log reg. Suggestions?
Thaks
Morten S
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