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Thank you very much for your response. In effect, I looked into Cooper et al. (2012), who proposed a hybrid coding with 2 base levels (one base level for attribute level only appears in the sq, coded as 0 and one other -1), such that:
if the original codes for attribute levels 3, 2, 1 are 2; 1; 0 ...

Thank you very much for your quick response!

I would prefer option 2, even with a cost of not knowing the asc for the statu quo alternative.

But I am still a little confused about the option 1. Could you kindly give me an explanation (mathematically or non-mathematically) why we can get only one ...

Dear all,
I've been looking for a solution to my design problem in many similar posts about dummy coding for statuquo alternative with attribute levels fixed and ONLY appear in the sq alternative. I have not found a clear answer yet. Maybe I misunderstood something.

I have 2 unlabeled ...