Cohen’s Kappa is a statistical measure used to evaluate the agreement between two raters who classify items into mutually exclusive categories. Unlike simple percentage agreement calculations, Cohen’s Kappa takes into account the agreement that could occur by chance, offering a more robust and nuanced assessment.
The value of Cohen’s Kappa ranges from -1 to 1, where 1 indicates perfect agreement, 0 indicates no agreement beyond chance, and negative values suggest systematic disagreement.
This metric is widely used in fields such as medicine, psychology, and content analysis, where subjective judgment is often necessary and consistency between evaluators is critical.