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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@hsphsun2.harvard.edu
Subject   Re: st: SAS versus Stata, Panel Study Logit models
Date   Thu, 20 Dec 2007 12:22:29 -0500

At 11:54 AM 12/20/2007, David M. Drukker wrote:
I do not know precisely what the other packages are doing, but specifying
the -nmp- option will change the divisor used in estimating the
working-correlation matrix from N to N-p, which is the most popular
small-sample adjustment.

        -- David
           ddrukker@stata.com
Thanks David. The -nmp- adjustment is apparently not the adjustment being made by SAS and SPSS, as using it does not yield the same results. Given that SAS and SPSS think the adjustment they are doing is good enough to make it the default, perhaps some future update of Stata could add it as an option? It always annoys me when I can't replicate results, because I'm not sure if I am doing something wrong or if it is some fundamental difference in the programs.

Oh, and while you are at it, adding Alternating Logistic Regressions would be nice too!


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Richard Williams, Notre Dame Dept of Sociology
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EMAIL: Richard.A.Williams.5@ND.Edu
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