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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Universit� di Catania - C.E.A.
Servizio di WebMail
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Universit� di Catania - C.E.A.
Servizio di WebMail
http://www.cea.unict.it
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