Tests for homogeneity of varianceTests for the homogeneity of variance of independent samples and their properties and assumptions.

Test	Purpose
F	Test if the ratio of the variances is equal to a hypothesized value. Assumes the populations are normally distributed and is extremely sensitive to departures from normality. The Levene and Brown-Forsythe tests are more robust against violations of the normality assumption than the F-test.
Bartlett	Test if the variances are equal. Assumes the populations are normally distributed and is extremely sensitive to departures from normality. The Levene and Brown-Forsythe tests are more robust against violations of the normality assumption than Bartlett's test.
Levene	Test if the variances are equal. Most powerful test for symmetric, moderate-tailed, distributions.
Brown-Forsythe	Test if the variances are equal. Robust against many types of non-normality.