Journal
BRITISH JOURNAL OF MATHEMATICAL & STATISTICAL PSYCHOLOGY
Volume 64, Issue 2, Pages 355-365Publisher
WILEY-BLACKWELL
DOI: 10.1348/2044-8317.002001
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Cohen's kappa is presently a standard tool for the analysis of agreement in a 2 x 2 reliability study, and weighted kappa is a standard statistic for summarizing a 2 x 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 x 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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