Equality of variances with 2 way factorial anova

[Haytch]

Hi there,

I have a project for a course I am doing, and we are supposed to run a 2-way ANOVA. I have used a pre-set to do this and there seem to be no tests for equality of variances which I need. Is there any way I can do this? 

Thanks.

[PaigeMiller]

In PROC GLM, use the HOVTEST of the MEANS statement performs this test, but only for a one-way model.

So, what you could do is to turn your two-way ANOVA into a one-way ANOVA for the purpose of performing this test. To do this, all possible combinations of your two way factors are combined into a single factor and then the HOVTEST will work. For example, using data set SASHELP.CLASS:

You have two class variables SEX (levels M and F) and several levels of AGE. To turn this into a single factor, you would have

F13

M13

F14

M14

etc.