Frequently Asked Questions
What does Cohen kappa measure?
Cohen kappa measures agreement between two raters on a categorical judgment while correcting for the agreement that would happen by chance.
Why not just use percent agreement?
Raw percent agreement can look high simply because one category is common. Kappa subtracts the chance baseline, giving a fairer measure of true agreement.
How do I interpret a kappa value?
Using the Landis and Koch scale, values from 0.4 to 0.6 are moderate, 0.6 to 0.8 are substantial, and above 0.8 are almost perfect agreement.
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