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

From   Doherr Marcus <>
To   "Stata List (E-mail)" <>
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

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

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

*   For searches and help try:

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