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I noticed that when I have tables which the values are only 0 and 1, I get a kappa of 1 when the table is completely full of one, and when I have a table of zeros I get NaN as result using the irr package and the kappa fleiss function.

I would expect the kappa to be also equals to 1 when the table is full of 0, as the 0 would represent agreement on 'No' and the full of 1s would represent agreement of 'Yes'.

What is the right way to interpret the results?

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