I'm very sorry for double posting!  My r-help setting Receive your own
posts to the list? is set to Yes, and Mail delivery is Enabled.  Yet I did
not get a copy of my post (this message is a reply from my sent mail).  I
only learned of the double posting when I found it copied in an r-help
archive.  Again, my apologies.

Luk Arbuckle

On Wed, Feb 1, 2012 at 13:47, Luk Arbuckle wrote:

> I'm looking for a function in R that extends kappa to multiple raters when
> there is more than one response per subject.  For example, say a group of
> doctors have to assign diseases to patients.  Each patient will be assigned
> one to many diseases, and the number of doctors assigning diseases to any
> one patient will be two to many.
>
> Here's an extremely simple example of the type of data I might have (two
> patients, three doctors, five diagnoses, and doctor 'x' assigns multiple
> diagnoses per patient):
>
> pat<-c('a','a','a','b','b','b','b')
> doc<-c('x','x','y','x','x','y','z')
> dx<-c('1','2','2','3','4','4','5')
> df<-data.frame(pat=pat,doc=doc,dx=dx)
> df
>
> I found a paper that can address this [1], although I can't find it
> referenced on cran.  What I have found on cran doesn't address the
> multi-response case.  I don't want to reinvent the wheel if this has
> already been implemented in R, and I'm still new to the language so I'm not
> a fast coder.  If anyone can help it would be greatly appreciated.
>
> Cheers!
>
> Luk Arbuckle
>
> [1] Kraemer, Helena. “Extension of the Kappa Coefficient.” Biometrics 36,
> no. 2 (1980). http://dx.doi.org/10.2307/2529972.
>

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