So sánh phương pháp

	Hệ số Kappa của Cohen	Kiểm định Chi-bình phương độc lập
Lĩnh vực	Thống kê	Thống kê
Họ	Hypothesis test	Hypothesis test
Năm ra đời	1960	1900
Người khởi xướng	Jacob Cohen	Karl Pearson
Loại	Inter-rater reliability coefficient	Nonparametric test of association
Công trình gốc	Cohen, J. (1960). A Coefficient of Agreement for Nominal Scales. Educational and Psychological Measurement, 20(1), 37–46.	Pearson, K. (1900). On the criterion that a given system of deviations from the probable in the case of a correlated system of variables is such that it can be reasonably supposed to have arisen from random sampling. Philosophical Magazine, 50(302), 157–175.
Tên gọi khác	kappa coefficient, kappa statistic, Cohen's Kappa (Değerlendiriciler Arası Uyum)	chi-squared test, Pearson's chi-square test, test of independence, ki-kare bağımsızlık testi
Liên quan	3	2
Tóm tắt	Cohen's kappa (κ) is a statistical measure of inter-rater reliability for categorical classifications, introduced by Jacob Cohen in 1960. Unlike simple percent agreement, kappa corrects for the level of agreement that would be expected purely by chance, making it the standard metric when two raters independently assign observations to the same set of mutually exclusive categories.	The chi-square test of independence is a nonparametric hypothesis test that examines whether two categorical variables are associated by comparing observed and expected frequencies in a cross-tabulation. It rests on the chi-square criterion introduced by Karl Pearson in 1900.