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Re Re st: Post-estimation messages on dropped variables


From   "Wendell Joice" <wjoice@erols.com>
To   "statalist hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re Re st: Post-estimation messages on dropped variables
Date   Tue, 17 Dec 2002 10:38:49 -0500

Thanks. This works! I appreciate it.
----- Original Message -----
From: "Ronan Conroy" <rconroy@rcsi.ie>
To: "statalist hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Sent: Monday, December 16, 2002 12:27 PM
Subject: Re: st: Post-estimation messages on dropped variables


> 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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