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Re: st: Post-estimation messages on dropped variables


From   Ronan Conroy <rconroy@rcsi.ie>
To   "statalist hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Post-estimation messages on dropped variables
Date   Mon, 16 Dec 2002 17:27:25 +0000

on 16/12/2002 5:07 pm, Wendell Joice at wjoice@erols.com wrote:

> After running some logistic regressions, I received two messages on dropped
> variables:
> 
> - (variable dropped due to estimability)
> 
> - (variable dropped because constant)

Try tabulating these variables against outcome. The one that is a constant
is a constant (same value for everyone). The estimability problem is harder.
How does this variable fare in a univariate model? What is it correlated
with?  

Ronan M Conroy (rconroy@rcsi.ie)
Lecturer in Biostatistics
Royal College of Surgeons
Dublin 2, Ireland
+353 1 402 2431 (fax 2329)

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