Σύγκριση μεθόδων

	Διεκτιμητική Αξιοπιστία (κ του Cohen και ICC)	Συντελεστής Άλφα του Cronbach (Ανάλυση Αξιοπιστίας)	Συντελεστής Kappa του Fleiss για Συμφωνία Πολλών Αξιολογητών
Πεδίο	Ψυχομετρία	Στατιστική	Στατιστική
Οικογένεια	Latent structure	Latent structure	Hypothesis test
Έτος προέλευσης	1960 (kappa); 1979 (ICC)	1951	1971
Δημιουργός	Cohen (kappa, 1960); Shrout & Fleiss (ICC, 1979)	Lee J. Cronbach	Joseph L. Fleiss
Τύπος	Reliability / agreement analysis	Reliability / internal consistency coefficient	Non-parametric agreement measure
Θεμελιώδης πηγή	Cohen, J. (1960). A Coefficient of Agreement for Nominal Scales. Educational and Psychological Measurement, 20(1), 37–46.	Cronbach, L. J. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16(3), 297–334.	Fleiss, J.L. (1971). Measuring Nominal Scale Agreement Among Many Raters. Psychological Bulletin, 76(5), 378–382.
Εναλλακτικές ονομασίες	inter-rater reliability, interrater agreement, rater agreement, Değerlendiriciler Arası Güvenilirlik (Cohen's κ, ICC)	coefficient alpha, alpha reliability, internal consistency reliability, Güvenilirlik Analizi (Cronbach Alpha)	multi-rater kappa, Fleiss kappa, Fleiss' Kappa (Çoklu Değerlendirici Uyumu)
Συναφείς	6	4	2
Σύνοψη	Interrater reliability quantifies the degree to which two or more independent raters produce consistent scores when evaluating the same individuals or products. The family encompasses Cohen's kappa, introduced in 1960 for categorical judgments, and the Intraclass Correlation Coefficient (ICC) for continuous ratings, together spanning most measurement scenarios encountered in behavioral, health, and educational research.	Cronbach's alpha is a coefficient of internal consistency that quantifies the degree to which a set of items on a scale measures the same underlying construct. Introduced by Lee J. Cronbach in 1951, it remains the most widely reported reliability index in social-science, health, and educational research.	Fleiss' Kappa is a non-parametric statistic for measuring the degree of agreement among three or more raters who classify items into mutually exclusive nominal categories. Introduced by Joseph L. Fleiss in 1971 as a generalization of Cohen's Kappa beyond two raters, it corrects observed agreement for the level of agreement expected by chance alone, making it the standard reliability index in medical diagnosis studies, content analysis, and multi-coder research.