I'm using STATA/SE 8.0. I have a data set involving 91 subjects. All
subjects have been rated by the same three raters (R1, R2 & R3) into one of
four categories. My data is arranged in the following manner:
Subject R1 R2 R3
1 1 1 2
2 4 3 4
.. .. .. ..
91. 3 3 3
The -kap- command allows me to generate a table of individual kappas, one
for each category (1, 2, 3 and 4), as well as a combined kappa (a so-called
"weighted average of the individual kappas"). The manual suggests that the
individual kappa for, say "category 2", would be the two-rating kappa where
category 2 is "positive" and all other categories (1, 3 & 4) are
"negative".
My question is: Given that our rating scale is ordinal, is there a way to
get STATA to generate a table of individual kappas based on a
dichotomization of the rating scale at each possible cut-off?
Many thanks in advance,
Jeffrey Quon
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