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st: AW: identifying obs actually used in a Logit model


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: identifying obs actually used in a Logit model
Date   Thu, 23 Apr 2009 13:20:21 +0200

<> 



*************
webuse lbw2, clear
logit low age lwt race2 race3 smoke ptl ht ui
gen byte used=e(sample)
ta used
*************



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Jiang, Frank
Gesendet: Donnerstag, 23. April 2009 13:17
An: statalist@hsphsun2.harvard.edu
Betreff: st: identifying obs actually used in a Logit model

Dear listers,

I am having difficulty identifying observations used in a logit model.
The model includes several sets of dummy variables.  Some observations
were automatically dropped because some dummy variables perfectly
predict failures, i.e. DV==0.  As a result, the number of obs used by
the logit model is smaller than the number of obs in the dataset.
However, I don't know which obs were excluded.  Is there a way to
identify the obs that were actually used in the model?

Thanks
Frank
 


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