**From:** Andrew Perrin (*clists@perrin.socsci.unc.edu*)

**Date:** Wed 30 Apr 2003 - 06:30:29 EST

**Next message:**Duncan Murdoch: "Re: [R] R help"**Previous message:**Peter Dalgaard BSA: "Re: [R] R help"

Message-id: <Pine.LNX.4.53.0304291623030.28395@perrin.socsci.unc.edu>

I have a data frame that contains two ratings on several variables for

each case. My objective at the moment is to calculate a Cohen's Kappa

score for each of these variables between the two raters. Jim Lemon has

kindly provided me with kappa.nom() to do the calculation, but I'm having

trouble getting the data into the right format.

Consider the variable "conv". It's now stored in a data frame such that

letters.df$first.conv contains the first coder's evaluation for conv, and

letters.df$second.conv contains the second coder's evaluation for conv.

The levels for all these factors are c(-1,0,1). kappa.nom() requires a

frequency table, such that for each case we have:

-1 0 1

2 0 0

That is, the count of ratings of -1 (in this case, both coders assigned

-1), the count of 0, and the count of 1. Is there a relatively easy way

to do this?

Many thanks.

----------------------------------------------------------------------

Andrew J Perrin - http://www.unc.edu/~aperrin

Assistant Professor of Sociology, U of North Carolina, Chapel Hill

clists@perrin.socsci.unc.edu * andrew_perrin (at) unc.edu

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