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Re: st: SAS versus Stata, Panel Study Logit models


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu, "Statalist" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: SAS versus Stata, Panel Study Logit models
Date   Wed, 19 Dec 2007 23:37:33 -0500

At 11:05 PM 12/19/2007, Joseph Coveney wrote:
Not sure, but nothing jumps out of Stata's on-line help file about this.

Could you have hit upon what's behind the statment, "There is one difference
between SAS 6.12 TS Level 0060 (and Windows version 4.10.1650) and Stata
that cannot be explained: The results (beta, working correlation matrix, and
standard errors) of using PROC GENMOD do not match xtgee when panels are
unbalanced." in www.stata.com/support/faqs/stat/xtgeesas.html ?
It would be nice if I had, because then, after all these years, the mystery would finally be solved. :) But in this case the panel is balanced, so I suspect not.

Those FAQs are a little old. I wonder if SAS has tweaked its behavior since they were written.

I'm not sure what SPSS means by "nonredundant parameters." Perhaps there is some sort of adjustment reflecting correlations between time-invariant variables like gender and race that do not change across time?


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Richard Williams, Notre Dame Dept of Sociology
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