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Re: st: intracluster correlation coefficient (ICC)

From   Joseph Coveney <>
To   Statalist <>
Subject   Re: st: intracluster correlation coefficient (ICC)
Date   Thu, 21 Apr 2005 09:13:17 +0900

Economicus wrote:

Hi! Is there a simple method to calculate ICC in Stata?


-findit intraclass- brings up -loneway-, if that's what you're looking for.  

A few years ago, I adapted Robert M. Hamer's SAS macro that provided for all of 
the intraclass correlation coefficients (and their confidence intervals) 
described in P. E. Shrout and J. L. Fleiss, Intraclass correlations: Uses in 
assessing rater reliability. _Psychological Bulletin_ 86:420-428, 1979.  It 
worked for balanced datasets (it called -anova-) for all of the various ICCs, 
and for unbalanced datasets (it called -xtreg-) one type of ICC.  StataCorp's 
rewrite of -anova- a while back broke it for some reason that I wasn't able to 
uncover.  Datasets in practice are rarely nicely balanced, so there hasn't been 
much incentive to fix it.

When -xtmixed- is available, I plan go back and re-work it, and add the 
additional ICCs described in K. O. McGraw and S. P. Wong, Forming inferences 
about some intraclass correlation coefficients. _Psychological Methods_ 1:30-
46, 1996.

Joseph Coveney

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