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Re: st: Negative Binomial


From   "Axel Heitmueller" <A.Heitmueller@hw.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Negative Binomial
Date   Sat, 1 Feb 2003 10:18:32 -0000

Laurel,

if I understand you correctly, your alpha test is insignificant, which 
means you cannot reject the null of equidispersion. however, have 
you used the robust option or pweights? in that case you shouldn't 
relay on the LR test as the regression does not produce the `true' 
log likelihood (there is some stuff on the web concerning this point, 
I just can't remember where). alternatively, you could perform a 
simple t-test and see whether the result remains the same. 

axel

Axel Heitmueller, 
Centre for Economic Reform and Transformation, CERT
School of Management
Heriot-Watt University
Edinburgh
EH14 4AS
UK
phone +44(0)131 451 3969
fax +44 (0)131 451 3296
a.heitmueller@hw.ac.uk
www.som.hw.ac.uk/somah3/
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