Levene’s test is a common test used to determine if your sample groups have equal variances. Bartlett’s test is also used frequently to test for homogeneity of variance.

Testing for Constant Variances The difference-from-nominal chart should be accompanied by a test that checks whether the variances for each product type are identical (homogeneous). Levene's test of ...

Homogeneity of Variance in One-Way Models One of the usual assumptions for the GLM procedure is that the underlying errors are all uncorrelated with homogeneous variances. You can test this assumption ...