Reliability Assessment of a Measure: The Kappa Statistic. Issue 4 (October 2016)

• Record Type: Journal Article
• Authors: Franco, Francesco; Di Napoli, Anteo
• Is Part Of: Giornale di tecniche nefrologiche e dialitiche. Volume 28:Issue 4(2016)
• Page Start: 289
• Page End: 292
• Publication Date: 2016-10
• Subjects: Cohen's Kappa -- Inter-rater agreement -- Intra-rater agreement -- Reliability -- Weighted Kappa; Nephrology -- Periodicals; Dialysis -- Periodicals; 616.61005
• DOI: 10.5301/GTND.2016.16402
• Languages: English
• ISSNs: 0394-9362

Abstract

The Kappa coefficient is a measure of inter-rater agreement. This statistic measures observed agreement greater than chance and can range from -1 to 1. A value of zero indicates statistical independence and a value of 1 indicates a perfect agreement between observers. The value of Kappa is influenced by the prevalence of the evaluated condition: two observers can have a high observed agreement but low Kappa if the prevalence is very high or very low (paradox of the Kappa statistic).