Methoden vergleichen

	Levene- und Brown-Forsythe-Test auf Varianzgleichheit	Bartlett-Test auf Varianzhomogenität
Fachgebiet	Statistik	Statistik
Familie	Regression model	Hypothesis test
Entstehungsjahr	1960	1937
Urheber	Howard Levene; Morton B. Brown and Alan B. Forsythe	Maurice Stevenson Bartlett
Typ	Homogeneity of variance test (robust)	Parametric variance homogeneity test
Wegweisende Quelle	Levene, H. (1960). Robust Tests for Equality of Variances. In Contributions to Probability and Statistics: Essays in Honor of Harold Hotelling. Stanford University Press.	Bartlett, M. S. (1937). Properties of sufficiency and statistical tests. Proceedings of the Royal Society of London. Series A, 160(901), 268–282.
Aliasnamen	Levene test, Brown-Forsythe test, homogeneity of variance test, Levene ve Brown-Forsythe Varyans Testi	Bartlett's Chi-Square Test, Test for Equality of Variances, Bartlett's Homogeneity Test, Varyans Homojenliği Testi
Verwandt	5	2
Zusammenfassung	The Levene and Brown-Forsythe test checks whether two or more groups share the same variance (homogeneity of variance). Levene (1960) built the test on absolute deviations from each group mean, and Brown and Forsythe (1974) made it robust to non-normal data by centring on the group median instead.	Bartlett's Test is a classical parametric procedure for testing whether two or more independent groups share a common population variance. Introduced by Maurice Stevenson Bartlett in 1937, it formalises the null hypothesis that all group variances are equal by constructing a chi-square statistic from the ratio of pooled to individual group variances. It is a standard pre-analysis step before applying ANOVA or other procedures whose validity depends on the homoscedasticity assumption.