Hi,
When performing a DSD, you are given the option for applying rules of "obeys strong heredity" for quadratics, and for interactions.
I believe that this limits the model and allows only for interactions that contains both as main effects. I'm not positive how this works for quadratics unless it only allows for quadratics that are found to have a main effect as well.
When evaluating your DSD, how do you determine what the "best" model is for your data? I get very different answers depending on which options I choose here so I would like to have some metric/rationale for my choice before proceeding with further designs.
