I'm trying to create a model with a 3-way interaction term. I selected the variables and clicked on "cross" per JMP instructions for 2 or more variables. But JMP gives me the following warning:
"The model is missing an effect
Which is especially odd since what I entered into the model, and what appears in the dialog box, is:
Any thoughts on how to resolve this?
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If you want the term X1*X2*X3, then you must also include X1*X2, X1*X3, and X2*X3 to maintain the linear model hierarchy, even if these lower order terms are not significant.
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Ahhh, you're right! I was thinking that only the lower order terms needs to be included. Thanks!