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1 results

  • Cohen’s Linearly Weighted Kappa is a Weighted Average of 2×2 Kappas

  • Matthijs J. Warrens
  • Journal:
    Psychometrika / Volume 76 / Issue 3 / July 2011
    Published online by Cambridge University Press:
    01 January 2025, pp. 471-486

  • An agreement table with n∈ℕ≥3 ordered categories can be collapsed into n−1 distinct 2×2 tables by combining adjacent categories. Vanbelle and Albert (Stat. Methodol. 6:157–163, 2009c) showed that the components of Cohen’s weighted kappa with linear weights can be obtained from these n−1 collapsed 2×2 tables. In this paper we consider several consequences of this result. One is that the weighted kappa with linear weights can be interpreted as a weighted arithmetic mean of the kappas corresponding to the 2×2 tables, where the weights are the denominators of the 2×2 kappas. In addition, it is shown that similar results and interpretations hold for linearly weighted kappas for multiple raters.