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st: Inconsistent binreg


From   Leonelo Bautista <lebautista@wisc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Inconsistent binreg
Date   Fri, 18 Jun 2004 10:58:33 -0500

I wonder if somebody in the list or from Stata could explain the following
inconsistency between the original version of "binreg" and the version in
Stata 8.0. Briefly, for the same data set and model the original binreg with
the rr option converges, but the new one does not. Convergence with the or
option does not seem to be a problem.

See example below.

(obinreg is the original binreg)

. obinreg obeabdo obesidad edadr if sex==1, rr eform nolog
Residual df  =      1066                          No. of obs =      1069
Pearson X2   =  903.1589                          Deviance   =  1171.045
Dispersion   =   .847241                          Dispersion =  1.098541

Bernoulli distribution, log link
----------------------------------------------------------------------------
   obeabdo | Risk Ratio   Std. Err.      z    P>|z|     [95% Conf. Interval]
-----------+----------------------------------------------------------------
  obesidad |   1.199856   .0611339     3.58   0.000     1.085825    1.325863
     edadr |   1.031502   .0022952    13.94   0.000     1.027013     1.03601
----------------------------------------------------------------------------

. binreg obeabdo obesidad edadr if sex==1, rr nolog
convergence not achieved
r(430);

Leonelo E. Bautista
University of Wisconsin Medical School
Population Health Sciences


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