How do I constrain X3 to 0 if and only if X2 level is 0 in custom design?
Hi All, I am trying to generate a custom design with one continuous factor, X1, and two discrete numeric factors, X2 and X3. The two discrete numeric factors are interdependent such that if X2=0 then X3 doesn't apply. To be specific, X2 is concentration of a molecule and X3 is molecular weight. If I have a molecule concentration of 0 for my sample, then there is no molecular weight because there i...