On 12/23/2009 01:58 AM, Julia Myatt wrote:
Hi,
I am having problems getting cohen's kappa to work. I have been using the
function:
<-ckappa(x,y)
from the psy package.
I am trying to test for inter-observer reliability, I have 2 observers and 26
categories, however, the two observers might not necessarily have the same
range of categories (I have unequal score ranges). However, I thought R could
cope with this.
Each time I try the function above I get the following output:
Error in ckappa(ob1, ob2) : unused argument(s) (ob2)
I got this even when I altered the data to have equal score ranges, therefore I
am not sure what this means or what I should do!!
Any help in this area would be much appreciated, or anything about the best way
to deal with inter-observer reliability (my data is all categorical),
Hi Julia,
The ckappa function only takes one argument, a rater by object matrix or
dataframe of scores. Try:
ckappa(cbind(ob1,ob2))
Jim
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