You can test this assumption in PROC GLM by using the HOVTEST option in the MEANS statement, requesting a homogeneity of variance test. This section discusses the computational details behind these ...

Levene's test of homogeneity is particularly appropriate for short run ... You can implement Levene's method by using the GLM procedure to construct a one-way analysis of variance for the absolute ...

These tests do not rely on the assumptions required ... some statistical techniques can be robust against violations of normality or homogeneity of variance, making it unnecessary to strictly ...