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Re: st: uting for Non-independent observations using -xtgee- or -xtlogit-, pa???


From   "Wendell Joice" <wjoice@erols.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: uting for Non-independent observations using -xtgee- or -xtlogit-, pa???
Date   Mon, 3 Mar 2003 22:42:36 -0500

Thanks Ricardo,
I was not aware of your suggested approach and, now, having read up on it,
it appears to be the very thing I need.

Wendell Joice
Washington, DC

----- Original Message -----
From: "Ricardo Ovaldia" <ovaldia@yahoo.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Sunday, March 02, 2003 9:02 PM
Subject: Re: st: uting for Non-independent observations using -xtgee-
or -xtlogit-, pa???


> --- Wendell Joice <wjoice@erols.com> wrote:
> > Dear statalist,
> > Using stata 7, I am trying to perform a logistic
> > regression analysis on a
> > dataset, covering several years, consisting of
> > physician visit data and
> > various demographic or visit characteristic
> > variables. My basic unit (observation) is an
> > individual patient visit to a
> > physician. Each visit consists of a different
> > patient (no repeated visits
> > for any given patient) but each of the physicians
> > has several patients.
> >
> > (1) I am concerned about intra-physician correlation
> > (non-independence of
> > observation violation) on the visits (possible
> > correlation
> > between visits that occur to the same physician)
>
> I don't think the -xt- commands which are meant to be
> used with longitudinal data are appropriate. I would
> either use -logistic- clustering on physician, to
> obtain robust SE, or use -clogit- grouping on
> physician.
>
> Regards,
> Ricardo.
>
> =====
> Ricardo Ovaldia, MS
> Statistician
> Oklahoma City, OK
>
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