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st: Analysis of a matched study with random (herd cluster) effects


From   Doherr Marcus <marcus.doherr@itn.unibe.ch>
To   "Stata List (E-mail)" <statalist@hsphsun2.harvard.edu>
Subject   st: Analysis of a matched study with random (herd cluster) effects
Date   Fri, 12 Sep 2003 10:52:20 +0200

Dear all,

we have a study in which case farms were identified, then control farms were
matched to them on region and herd size (one control per case), and finally
between 5 and 13 cows per farm (depending on farm size) were randomly
enroled in the study.

In order to evaluate the association between several cow and herd level
variables and a binary (0/1) outcome variable, a logistic regression model
seems suitable. However, both the matching at farm level and the cluster
effect of several cows per farm in the study need to be considered in the
analysis.

I am looking for some recommendations on how to tackle this analysis problem
in STATA.

Thanks for your advice - Regards  Marcus

___________________________________________
PD Dr. Marcus Doherr, Ph.D.
Dipl. ECVPH, FTA Epidemiologie
NeuroCenter & Abteilung Klinische Forschung
* Dept. Klinische Veterinärmedizin, Universität Bern
Bremgartenstrasse 109A, Postfach, CH - 3001 Bern
* +41.31.631.2428 FAX ...2538
* marcus.doherr@itn.unibe.ch
www.neurocenter-bern.ch



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