Re: st: overdispersion

[Richard Gibson <Richard.Gibson@newcastle.edu.au>]

Usha,

 

You might want to look at

 

http://www.ats.ucla.edu/stat/stata/library/count.htm

 

and also at

 

http://www.stata.com/support/faqs/stat/nbreg.html

 

if the overdispersion relates to excess zeros

 

Richard

>>> ushabishan@yahoo.co.in 23/01/2006 7:20:43 pm >>>
Dear all,
Pl. tell me whether stata takes care of overdispersion while estimating poisson regression. My data set has this problem because standard deviation is greater than the mean value. Do I apply negative binomial to overcome this problem?
Thanks

usha

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