st: using constraints with nbreg

[Wendy Regoeczi <w.regoeczi@csuohio.edu>]

Greetings all,
I am trying analyze negative binomial regression models. I have read that 
if you add the natural logarithm of the population at risk to the 
regression model and give it a fixed coefficient of one, the model becomes 
an analysis of rates rather than counts, which is what I want. But I am 
having trouble figuring out how to use the "constraint" option in nbreg to 
accomplish this. Can anyone tell me what the correct syntax is?
Many thanks,
Wendy Regoeczi

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