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aggreement
2007 Mar 22
3
Cohen's Kappa
...be look into the
Kappa function code. Is the easy formula really wrong?
kappa=agreement-chance/(1-chance)
many thanks
christian
###############################################################################
true-negativ:7445
false-positive:3410
false-negativ:347
true-positiv:772
classification-aggrement:68,6%
kappa=agreement-chance/(1-chance) = (0.686-0.5)/0.5=0.372
.....with function from library(vcd)
Kappa(matrix(c(7445,3410,347,772),nrow=2))
value ASE
Unweighted 0.1686882 0.011235188
Weighted 0.1686882 0.007979293