![]() This uses the medians within group, rather than the mean, and is recommended when normality may be suspect. The test is a function of the residuals and means within each group, though various modifications are used, including the Brown-Forsythe test. For ANOVA, this assumption can be tested via Levene's test. The assumption of equal variances among the groups in analysis of variance is an expression of the assumption of homoscedasticity for linear models more generally.
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