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st: ICC in crossed effects models
From
"Cohen, Elan" <[email protected]>
To
"'[email protected]'" <[email protected]>
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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