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st: logistic reg version 8 & 11


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: logistic reg version 8 & 11
Date   Thu, 9 Sep 2010 09:19:55 -0700 (PDT)

I wrote a program a while back using version 8 and I notce the -logistic- gives different results. The results under version 8 differ from those under version 11. Why is this? Which is correct?

. version 8

. xi: logistic  case i.x
i.x               _Ix_1-3             (_Ix_1 for x==A_A omitted)

Logistic regression                               Number of obs   =       1195
                                                  LR chi2(2)      =       5.04
                                                  Prob > chi2     =     0.0806
Log likelihood = -665.32155                       Pseudo R2       =     0.0038

------------------------------------------------------------------------------
        case | Odds Ratio   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
       _Ix_2 |   2.14e-09          .        .       .            .           .
       _Ix_3 |   4.95e-09   3.08e-09   -30.80   0.000     1.47e-09    1.67e-08
------------------------------------------------------------------------------
Note: 0 failures and 1 success completely determined.

. version 11

. xi: logistic  case i.x
i.x               _Ix_1-3             (_Ix_1 for x==A_A omitted)

Logistic regression                               Number of obs   =       1195
                                                  LR chi2(2)      =       5.04
                                                  Prob > chi2     =     0.0806
Log likelihood = -665.32156                       Pseudo R2       =     0.0038

------------------------------------------------------------------------------
        case | Odds Ratio   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
       _Ix_2 |   1.02e-06   .0003817    -0.04   0.971            0           .
       _Ix_3 |   2.36e-06   .0008842    -0.03   0.972            0           .
------------------------------------------------------------------------------




Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


      
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