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Overview:

The kappa coefficient is a widely used statistic for measuring the degree of reliability between raters. SAS procedures and macros exist for calculating kappa with two or more raters, but none address situations when the kappa coefficient alone does not sufficiently describe the level of reliability. When the prevalence of a rating in the population is very high or low, the value of kappa may indicate poor reliability even with a high observed proportion of agreement. Researchers have recommended reporting several other values in addition to the kappa to address this and another paradox of the kappa statistic.

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Format:PDFSize:132 KB
Date:Feb 2009
Pages:7

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