Chance‐corrected measures for 2 × 2 tables that coincide with weighted kappa |
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Authors: | Matthijs J Warrens |
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Institution: | Leiden University, The Netherlands |
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Abstract: | Cohen's kappa is presently a standard tool for the analysis of agreement in a 2 × 2 reliability study, and weighted kappa is a standard statistic for summarizing a 2 × 2 validity study. The special cases of weighted kappa, for example Cohen's kappa, are chance‐corrected measures of association. For various measures of 2 × 2 association it has been observed in the literature that, after correction for chance, they coincide with a special case of weighted kappa. This paper presents the general function, linear in both numerator and denominator, that becomes weighted kappa after correction for chance. |
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