Σύγκριση μεθόδων

	Συντελεστής Kappa του Cohen	Συντελεστής Άλφα του Cronbach (Ανάλυση Αξιοπιστίας)
Πεδίο	Στατιστική	Στατιστική
Οικογένεια	Hypothesis test	Latent structure
Έτος προέλευσης	1960	1951
Δημιουργός	Jacob Cohen	Lee J. Cronbach
Τύπος	Inter-rater reliability coefficient	Reliability / internal consistency coefficient
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.
Εναλλακτικές ονομασίες	kappa coefficient, kappa statistic, Cohen's Kappa (Değerlendiriciler Arası Uyum)	coefficient alpha, alpha reliability, internal consistency reliability, Güvenilirlik Analizi (Cronbach Alpha)
Συναφείς	3	4
Σύνοψη	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.	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.