Re: [R] stratified kappa (measure agreement or interrater reliability)?

From: David Winsemius <dwinsemius_at_comcast.net>
Date: Fri, 31 Oct 2008 10:30:30 -0400

On Oct 30, 2008, at 11:38 PM, FD wrote:

> Hi All:
> Could anyone point me to a package that can calculate stratified
> kappa? My
> design is like this, 4 raters, 30 types of diagnosis scores, 20
> patients.
> Each rater will rate each patient for each type of diagnosis score.
> The
> rater's value is nominal.
>
> I know I can measure the agreement between raters for each type of
> diagnosis
> score, e.g., calculate out 30 kappa values. My problem is I want to
> have an
> overall agreement measure (a single value and its significance over
> chance).
> Could anyone help me with this?

I am not a statistician or a psychometrician, so have no experience with any of these packages. A google search on produced this link: http://www.mail-archive.com/r-help@stat.math.ethz.ch/ msg89858.html ... and looking in package psy in CRAN, I see lkappa(), Light’s kappa for n raters, which seems to meet your specifications.

The concord package may have the facilities but I am not able to tell from the documentation. Perhaps Jim Lemon can be queried.

-- 
David Winsemius
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Received on Fri 31 Oct 2008 - 14:35:23 GMT

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