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st: constant in a poisson regression


From   "Rafael Terra de Menezes" <[email protected]>
To   [email protected]
Subject   st: constant in a poisson regression
Date   Sat, 11 Feb 2006 23:45:20 -0200

Dear Stata users,

I�m begginer at stata and I would appreciate any help.


I'm working with a count model (poisson) to show the relationship between health and income. My dependent variable is number of chronicle diseases of a person and the independent variables are genderand income, quite simple. I ran the regression and the LR test return awful results, and the coefficients were not significant. I tried to run the model without constant and the results were fine, including the poisgof test.
Is there any problem in suppressing the constant?

Thanks a lot

Ana Carolina Pereira Zoghbi
University of Sao Paulo
Brazil
FEARP-USP


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