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st: -intgph nbreg- drops interaction variables
From
Müller Barbara <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: -intgph nbreg- drops interaction variables
Date
Mon, 14 Mar 2011 15:07:31 +0000
Dear Statalist-members
When I use the -intgph- command (from SSC-Archives) with a -nbreg- model, I get the message that my interaction variables were dropped. The analysis can be reproduced with the nlsw88 example Stata-dataset. This is the code I used:
webuse nlsw88
intgph nbreg tenure, ivars (age south)
It returns this error message:
ageXsouth has been dropped by nbreg
ageXsouth is the product of the interaction vars
r(499);
If I use the same command with a -poisson- model, the model runs fine:
intgph poisson tenure, ivars (age south)
My Stata version and ado-files are up to date.
Any suggestions are greatly appreciated.
Barbara Mueller
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