Hi, I am trying to test homogeneity for a two way ANOVA, (linearity assumption was alreay verified), but It doesn't work, I read that Levene's test is only for one way ANOVA PROC GLM DATA=clus_ConHR; CLASS Cluster agegroup; MODEL vitesse_trt = Cluster agegroup Cluster*agegroup; means Cluster*agegroup/ HOVTEST=levene(type=ABS); run; quit; How should I test homogeneity using SAS in this model? Should I construct a plot with the residuals?
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