--- On Mon, 16/3/09, Justin B Echouffo Tcheugui wrote:
> I am trying to assess the effect of a preventive
> intervention on mortality data in a cluster randomised
> trial. The randomisation units were clinics in which my
> patients are nested. I am trying to assess the efcct
> of the intervention on mortality.
-stcox- has already some multilevel models built-in in
the form of the -shared()- option. To estimate such a
model you can type:
xi: stcox i.randomgroup, shared(clinic)
There is a good discussion of this option in:
Mario Cleves, William Gould, Roberto Gutierrez, and
Yulia Marchenko (2008) "An Introduction to Survival
Analysis using Stata". College Station: Stata Press.
http://www.stata-press.com/books/saus.html
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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