On Feb 1, 2012, at 3:13 PM, Luk Arbuckle wrote:
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.
I actually had a chance to prevent that second posting. It looked
familiar when viewed in the moderation queue and I took a quick look
at what was in my inbox but since you used a different subject line my
search failed.
Speaking of searching ... you are asked in the Posting Guide (that no
one reads) to post the specifics of your own efforts. My first search
with "multi-rater kappa" failed. My second search is here:
http://search.r-project.org/cgi-bin/namazu.cgi?query=multiple+raters+kappa&max=100&result=normal&sort=score&idxname=functions&idxname=Rhelp08&idxname=Rhelp10&idxname=Rhelp02
Having gotten more than one apparently on-target result with
relatively minor effort, I see no point in my expending even more time.
--
David.
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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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David Winsemius, MD
West Hartford, CT
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