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Kappa Example
P(A) = 370/400 = 0.925
P(nonrelevant) = (10+20+70+70)/800 = 0.2125
P(relevant) = (10+20+300+300)/800 = 0.7878
P(E) = 0.2125^2 + 0.7878^2 = 0.665
Kappa = (0.925 – 0.665)/(1-0.665) = 0.776
Kappa > 0.8 = good agreement
0.67 < Kappa < 0.8 -> “tentative conclusions” (Carletta ’96)
Depends on purpose of study
For >2 judges: average pairwise kappas
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