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st: RE: Intraclass correlation coefficient analyses in STATA


From   "Visintainer, Paul" <Paul.Visintainer@baystatehealth.org>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Intraclass correlation coefficient analyses in STATA
Date   Fri, 9 Sep 2011 10:14:54 -0400

Dr. Ringdal,

You might also look at -xtmrho- which is used after -xtmixed-.  If you have questions about the -icc23- program, you can contact me at visint46@gmail.com, as given in the help file.

-p
________________________________________________
Paul Visintainer, PhD


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Ringdal Kjetil Gorseth
Sent: Friday, September 09, 2011 8:20 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Intraclass correlation coefficient analyses in STATA

Hi

I am trying to calculate  Intraclass Correlation Coefficients (ICC) in STATA, but have run into some problems.

I wonder if you could give some info abut how to calculate ICC in STATA for a two-way mixed model (ICC[3,1]) measuring absolute agreement between two raters (Each target is rated by each of the same k raters, who are the only raters of interest). I would like to analyse agreement between a group a 10 raters raters, but focus on analysing two raters at a time.

See the paper "Shrout P, et al. Intraclass Correlations: Uses in Assessing Rater Reliability. Psychol Bull. 1979; 86(2):420" on different types of ICC.

In SPSS there is an easy way of doing this (I can find the two-way mixed, two-way random, and one-way random effects models), but I cannot find the same in STATA. I have tried the -loneway- command, but this does not produce the same ICC or the same 95% CI values as in SPSS. In SPSS, I can also analyse all raters against each other.

Neither the -icc23- or the -icccof- commands produce the same values as the SPSS command.

Do you have any other suggestions on how to do the analyses in STATA?

Kind regards
Dr. Kjetil Ringdal

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