Is it possible to have one factor which is not significant in a response surface model but the quadratic term for the same factor is?
I'm trying to model one of my responses in JMP which has been evaluated using a DoE CCD design. In the DoE model, I have one factor which is not significant to the model around this response (p >0.05) but the quadratic term is significant (p<0.05). According to the Effect Hereditary Principle, in order for an interaction to be significant, at least one of its parent factors should be significant. ...