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I have to calculate the inter-agreement rate using cohen's kappa. However, I only know how to do it with two observers and two categories of my variable.

My task now is this:

I have a set of tweets. Each tweet should be rated as positive/negative/neutral by two observers, thus I have two observers yet 3 categories.

How should the formula of this look like?

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I find this document taken from this refresher on Bivariate Statistics Hand-Computation Cache from the University of Nebraska–Lincoln to be clear:

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