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st: intracluster correlation coefficient after Cox regression


From   "Elmir Omerovic" <elmir.omerovic@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: intracluster correlation coefficient after Cox regression
Date   Fri, 18 Oct 2013 23:45:31 +0200

Dear all, 

I am a cardiologist with interest in statistics and stata. I am working with
a large hierarchical database (~700 000 observations) and we are interested
in different question in regard to prediction of patients outcome e.g.
survival. 

I would be very grateful if someone could help me with the following
question. How to calculate ICC (i.e. intracluster correlation coefficient)
for a particular set of data. I have try to google this but was unable to
find something appropriate (that I can understand properly). Perhaps I have
misunderstood the concept. If we model the survival with e.g. shared frailty
Cox-regression (with hospitals as clusters) how do I calculate ICC from the
model? 

Thank you! 

Elmir Omerovic MD, PhD 
Sahlgrenska University Hospital 
Gothenburg, Sweden

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