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Putting the Kappa Statistic to Use - Nichols - 2010 - The Quality Assurance Journal - Wiley Online Library
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AgreeStat/360: computing weighted agreement coefficients (Conger's kappa, Fleiss' kappa, Gwet's AC1/AC2, Krippendorff's alpha, and more) for 3 raters or more
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Fleiss' kappa in SPSS Statistics | Laerd Statistics