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From   [email protected]
To   [email protected]
Date   Fri, 31 Jan 2003 11:10:46 +0100

I am trying to run a regression model having as depedent variable a count 
variable. The mean of this variable is 0.344 and the variance 0.745. I have 
tried to fit a negative binomial model to the data, but the alfa test is not 
significant, while the goodness of fit of the poisson model is much better. 
However, when I used the nbvargr command to obtain the parameter estimates and 
the relative graph the negative binomial distribution seems to fit better the 
data. Am I missing something? 

Many thanks

Grazia


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