--- Wendell Joice <[email protected]> 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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