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st: ztnb missing values from regression output


From   Megan McKeown <mmckeown@uwo.ca>
To   statalist@hsphsun2.harvard.edu
Subject   st: ztnb missing values from regression output
Date   Sun, 29 Mar 2009 09:23:07 -0400

Hello Statalist,
I am running a zero-truncated negative binomial regression using the option 'cluster'. The output gives no values for the standard error of alpha and lnalpha and no values for the confidence intervals. When I run this regression omitting the 'cluster' option these values are present. Any suggestions as to what is causing this?
Thanks,
Megan



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