[Limdep Nlogit List] About dominance in D-optimal design

[Lixian Qian]

Hello, DCM experts,

I am not sure whether this is the best place to ask a question about alternative dominance in DCM experiment design, but I hope you can give me some advices.

We have a D-optimal stated preference experiment design with 4 alternatives. We find in some scenarios, alternative B dominates alternative A.
We are not sure whether the scenarios with alternative dominance should be removed from the design. If removed, will the design still be optimal?

We had some pilot data based on the DCM experiment design. No matter whether we remove scenarios with alternative dominance, the choice model analysis based on NLogit does not show significant differences on key attributes. Does it mean it is acceptable for us to keep all scenarios in the formal data collection?

Thank you.


Best Regards,
Lixian