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RE: st: Zero Inflated Poisson


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Zero Inflated Poisson
Date   Fri, 14 Dec 2007 16:06:41 -0000

I had in mind also, and perhaps I should spell this out, 
that the results in terms of t statistics and so forth 
should send signals about which variables were less 
valuable. 

Maarten buis

--- "francesca.modena" <francesca.modena@email.unitn.it> wrote:
> I run a zero inflated poisson model. The sample is 409 observations,
> with 87 nonzero observations and 322 zero observations. There are 42
> independent variables. <snip> Can you suggest me if 42 parameters are
> too many for my sample?

Nick already answered that Stata will tell you if it is completely
impossible to estimate this model. However, even if Stata gives you
output I would still be very nervous about such a model with this data.
Do you really need all 42 variables?


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