[R] Cohen's Kappa for beginners

Jason Priem priem at email.unc.edu
Tue May 25 10:01:08 CEST 2010

I've got two vectors with ratings from two coders, like this:

x<-c("red", "yellow", "blue", "red")  #coder number 1
y<-c("red", "blue", "blue", "red") #coder number 2

I want to find Cohen's Kappa using the wkappa function in the psych 
package.  The only example in the docs is using a matrix, which I'm 
afraid I don't understand--I don't know how to get there from what I've 
got.  Could anyone point me in the right direction?  Thanks!

Jason Priem
UNC Royster Fellow
School of  Information and Library Science
University of North Carolina at Chapel Hill

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