Hi, all,
Usually there is a log likelikhood ratio test statistics reported after a
negative binominal regression (I ran possion regression first, and then
used 'nbreg' regression), and sometimes the Z score for alpha is reported
too. But in my case, I didn't see the ratio reported after the
regression, and there is no z score for alpha. Then I tried to use
'lrtest' after the model, but it says
"lrtest not valid after robust
specify force option to perform test anyway".
So I put 'force' in option, but it still didn't give me the result.
Can anybody tell me what's going on?
Ying
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
