I'm a newb with R and am trying to move from proprietary stats tools to open
ones. Hopefully this post might help others doing the same.
I downloaded the R package for Mac and hacked together a couple scripts, but
couldn't seem to get the right output. After installing the psych package, I
tried the test script included in this thread on the console, but I got
similar results to a prior poster:
> x
[1] "red" "yellow" "blue" "red"
> y
[1] "red" "blue" "blue" "red"
> ck <- cohen.kappa(cbind(x,y))
Error in counts[i, j] <- sum(scores[i, ] == score.levels[j], na.rm = TRUE) :
subscript out of bounds
In addition: Warning messages:
1: NAs introduced by coercion
2: NAs introduced by coercion
Since I got the impression that there may be a version problem, I updated
the psych package to the most recent version, 1.0-94 (from source). After
this, I tried over and over to run the cohen.kappa command, and still kept
getting the same error.
So I quit R and restarted it, then went to the package manager and selected
the checkbox next to "psych" to load it, and tried to re-run the command.
This time I got the expected output:
Call: cohen.kappa1(x = x, w = w, n.obs = n.obs, alpha = alpha)
Cohen Kappa and Weighted Kappa correlation coefficients and confidence
boundaries
lower estimate upper
unweighted kappa 0.098 0.6 1.10
weighted kappa -0.693 0.0 0.69
Number of subjects = 4
Lesson learned: close and restart the Mac client if you're using the GUI
front-end in order for changes to the package manager to take effect.
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