Hi Steve Thanks for the answer, and would love it if you could go a little deeper into your comment. As suggested I repeated my analysis using glmselect, and again model1 is chosen over the rest, but model2 has a higher R^2. So what you said is relevant, but I'd appreciate it if you could explain a bit more. The other piece of information to add is that glm of model 1 gives a significant effect for scalevar1*classvar1, whereas glm of model 2 is only significant for the main effect of scalevar1. Thanks Neri
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