Definition
The kappa coefficient, sometimes known as Cohen’s kappa after its originator, is a nonparametric statistic that assesses the degree of association between categorical variables. It was originally developed as a way to assess agreement among raters when subjective qualitative judgments were made. It can be thought of as a correlation coefficient describing the relation or shared variance between two categorical-level variables.
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Brennan, & Prediger. (1981). Coefficient kappa: Some uses, misuses, and alternatives. Educational and Psychological Measurement, 41, 687–699.
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Franzen, M. (2018). Kappa Coefficient. In: Kreutzer, J.S., DeLuca, J., Caplan, B. (eds) Encyclopedia of Clinical Neuropsychology. Springer, Cham. https://doi.org/10.1007/978-3-319-57111-9_1210
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DOI: https://doi.org/10.1007/978-3-319-57111-9_1210
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