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st: intraclass correlation?


From   Harrison Alter <doctordad@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: intraclass correlation?
Date   Tue, 30 Apr 2013 13:52:31 -0700

Hello Statalisters,

I have a dataset of 47 patients, each with 106 variables.  Each of
these patient's charts was abstracted by 2 raters, of a pool of 3.
The data are in wide format, so that each observation looks something
like this:

ID   Sex_EL    Sex_ SH    Sex_RO     DOB_EL    DOB_SH     DOB_RO
1        1                .               1               11/8/55
   .             11/8/55

The outcomes of interest are scores on a 16-point symptom scale, and
total drug dose in milligrams,10 outcomes in all, all continuous.

I would like to calculate a measure of inter-rater agreement, focusing
on the outcomes of interest.  I understand that kappa works best with
dichotomous outcomes, so I would like to perform some measure of
intraclass correlation.

Questions:

(1) Is this the right approach?
(2) What is the right analytic test?
(3) Can I do it in wide or must I reshape?  Since all 106 variables
repeat 3 times, that will be a lot of work!

Happy to provide any details that might help in solving my problem.

Thanks,

Harrison Alter

--
Harrison Alter, MD, MS, FACEP
Research Director
Department of Emergency Medicine
Alameda County Medical Center - Highland Campus
1411 East 31st Street
Oakland, California 94602

Executive Director
Andrew Levitt Center for Social Emergency Medicine
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