Hi,
 
I'm trying to verify the assumption of homogeneity of variance of residuals in an ANOVA with levene.test. I don't know how to define the groups. I have 3 factors : A, B and C(AxB).
 
What do I have to change or to add in the command to set that I'm working with the residuals and to set the groups?
 
library(car)
attach(anova.sns2)
levene.test(residuals ~ ???)


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