Hello everyone! I am trying to do a fractional factorial design for a choice experiment, with one constraint. Is anyone aware on how to do it? I have three factors, 2 with 3 levels and 1 with 2 levels: L1: A B and C; L2: F D and J; L3: Black and Red. When the last is Red, it does only combine with D, but not with F or with J, though it does with A B & C. Can anyone help?
Hi!! Thank you for your answer!! It works in custom design, but I do not have the option within choice experiment. Also, what I would want is, following my example, that the combination X1=L2 with X3 to be excluded. Not X1=L1 or X1=L2, but X1=L2 with X3 (any of the levels). Any thoughts most welcome!