Message-ID: <21849168.post@talk.nabble.com>
Date: 2009-02-05T10:56:24Z
From: pgseye
Subject: How to do ICC
Hi,
I'm essentially wanting to calculate intra- and inter-observer variabilities
for the first principal component of an optic disc shape measure of a sample
of individuals, so from what I can work out I need to work out an intraclass
correlation coefficient(s).
For the intra-data, I have 2 measurements taken on each individual by the
same observer. For the inter-data, 2 observers have taken one measurement
each on the sample.
I've found the 'icc' function in the {psy} package, but am not sure how I'd
perform the intra- calculation as the data argument is an 'n*p matrix or
dataframe, n subjects p raters'.
Would I just substitute the replica for the rater?
Hope this makes sense - still learning about it all.
Thank you.
Paul
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