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Thanks a lot for your response. It was really helpful.

Dear Ngene team,

I've done an efficient design and I obtained a d-error value of 0.00008. However, I've seen in couple of publications that their d-error is not usually that small.
Is it possible to have such a small d-error or there might be something wrong in my design?

Many thanks,
Eli

Right, my only concern is that at the end, some variables may not even have the sign that we expected. I know it's very unlikely, but for example in the choice of a vehicle we usually expect a negative sign for the price of vehicle but it could also be positive arguing that more expensive vehicles ...

Thanks so much. Large prior was the issue indeed.
We actually plan to do a pilot. Do you suggest to do orthogonal design without any priors for the pilot?

Thanks again,
Elnaz

Dear Ngene team,

I'm trying to do a pivot design with a fixed level for the first alternative. One of my attributes has a fixed level of 22,000, but unfortunately any time I try to run my syntax I get an error and the software closes automatically, however when I try it with a smaller number such ...

Hi Ngene team,

Thanks for your great support and helpful manual and articles. I am trying to create an efficient design to evaluate WTP for electric vehicles in Canada. Before doing the main SP survey, we will do a pretest where we can get some ideas about parameter priors. I am thinking of doing a ...