Symmetry | Free Full-Text | An Empirical Comparative Assessment of Inter-Rater Agreement of Binary Outcomes and Multiple Raters | HTML
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Fleiss' kappa in SPSS Statistics | Laerd Statistics
AgreeStat/360: computing agreement coefficients (Fleiss' kappa, Gwet's AC1/AC2, Krippendorff's alpha, and more) with ratings in the form of a distribution of raters by subject and category