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st: RE: Intraclass correlation coefficient analyses in STATA
From
"Visintainer, Paul" <[email protected]>
To
"'[email protected]'" <[email protected]>
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 [email protected], as given in the help file.
-p
________________________________________________
Paul Visintainer, PhD
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Ringdal Kjetil Gorseth
Sent: Friday, September 09, 2011 8:20 AM
To: [email protected]
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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