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st: RE: Dropping var from log reg due to estimability


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Dropping var from log reg due to estimability
Date   Mon, 2 Mar 2009 10:44:27 -0000

I'm not clear what kind of answer you expect. 

"estimability" means being estimatable, or here strictly being _not_
estimatable. At its simplest, the signal is thus that -logistic- found
it too difficult to estimate the parameters in the model you specified. 

The underlying reason is likely to be that you are throwing far too many
predictors at the response. 

Nick 
n.j.cox@durham.ac.uk 

Ziad El-Khatib

Using -stepwise, pr(.20): logistic- I ran different variables (all of
them and dependent variables were dichotomous); got the text below
then got the rest in the model. Any tips what does estimability mean?


note: incomenone dropped because of estimability
note: awaycat dropped because of estimability
note: busycat dropped because of estimability
note: elsetoseecat dropped because of estimability
note: dailyroutinecat dropped because of estimability
note: depressedcat dropped because of estimability
note: othercat dropped because of estimability
note: incomeself dropped because of estimability
note: 42 obs. dropped because of estimability


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