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st: ICC in crossed effects models


From   "Cohen, Elan" <cohened@upmc.edu>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: ICC in crossed effects models
Date   Wed, 9 Feb 2011 09:50:55 -0500

I just read the following thread regarding crossed effects models:

http://www.stata.com/statalist/archive/2009-04/msg00376.html

I'm linking to that thread since my data & model are almost identical.

My question is regarding intraclass correlations for this model. Am I right in thinking that the random-effect under _all:identity, var(R.year) is the variance at the _year_ level, and the next random-effects parameter, NAME:Identity, var(_cons) is the variance at the _NAME_ level?

If so, is it correct to calculate the ICC at the year level as:

var(R.year)/(var(R.year)+var(_cons)+var(Residual) ?

Does it even make sense to think of ICCs in a crossed model?

Thanks for your time and help,

- Elan


--
Elan D Cohen, MS
Center for Research on Health Care Data Center
University of Pittsburgh


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