Hello, I am trying to run proc GLM considering disease severity on 102 samples and 3 environments. It is ok when I am considering only the variables by itself, but SAS does not give me p-values when I try the interaction between them. Why is that? Is it because my model is saturated? How can I have that interaction analysed? proc glm data=sev; class line env; model sev = line env line*env; run; Thank you.
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