Hi Jim, Thanks for your help, I tried that function which did result in an output. The only issue now is my summary looks like this:
Length Class Mode table 16 -none- numeric kappa 1 -none- numeric Not what I was expecting, this was the case when my data was in the following format: ob1 ob2 1 3 4 2 4 3 3 2 1 4 2 1 5 5 1 6 2 4 I then tried entering my data as a matrix like the one below (all this data is made up until I get it to work!): p1 p2 p3 p4 p5 p1 3 1 0 4 2 p2 3 5 0 7 1 p3 2 3 4 6 3 p4 4 1 0 4 0 p5 8 2 0 2 5 and this resulted in the same type of output: Length Class Mode table 36 -none- numeric kappa 1 -none- numeric If that is the kappa output (1) something isn't right as I purposely made the data without good interrater reliability! I was wondering if you have anymore tips as to what I am doing wrong? I'm afraid I'm very new to R so don't even know the basics!! Thanks for all your help, Julia. ________________________________________ From: Jim Lemon [...@bitwrit.com.au] Sent: 23 December 2009 02:15 To: Julia Myatt Cc: r-help@r-project.org Subject: Re: [R] Cohen's kappa, unequal score ranges 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 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.