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    Cohen's kappa or Fleiss kappa or both?

    Hi all, I am trying to compare 2 instruments, A and B, against the gold standard. The measurement outcome is dichotomous. 2 different raters, R1 and R2, each uses instrument A and B to rate each subject. So the data looks something like: ID, A_R1, A_R2, B_R1, B_R2...