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Thank you, Michiel, for cleaning up my code. Your responses to my questions are quite clear but I do have two follow-ups, if you do not mind.

Q6: You can leave out all attributes that result in zero utility for the status quo level. In this case, probably all of them since the dummy variables are ...

Beste Michiel,

After several years, I have found my way back to Ngene and I have a few questions that I hope you can respond to. For context: my colleagues and I will be conducting a WTP study on recreational values in a park. Every respondent will have a status quo with trails/viewpoints ...

Dank je, Michiel.

The responses are quite varied and I get seemingly logical results when I omit all data related to the opt-out alternative. So I suspect the problem comes from my data processing. But that is perhaps a discussion for another forum.

Regards,
Florian

Hi all,

I have been tasked with analysing responses to a choice experiment with 4 (nominal) attributes with either 2 or 3 levels. Respondents saw 9 choice situations, each of which had 2 non-labeled alternatives and an opt-out. The odd thing, to me, is that 48 D-efficient design matrices were ...