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I have finally settled on the following design for my main study. However, the best D-error I can get for my design is 0.27. Is this design efficient? If this is not good what can I do to improve upon the efficiency? The priors are mainly from my pilot

Syntax

Design
;alts = alt1*, alt2*, alt3 ...

Thank you very much Michiel. I will try implementing your recommendations and if there any concerns, i will get back to you.

In an attempt to design a very efficient DCE design using Ngene; I completed a pilot study with 49 respondents and have analyzed the data to derive prior parameters for my final DCE design. However, most of the parameters are insignificant and one (insurance premium) strangely has a positive sign ...

Thank you very much Michiel for this. I am very grateful.

Regards,
Gilbert

I will like to examine both the linear and non-linear effects of a particular attribute. Do I have to first enter a parameter (B) for the attribute without a dummy/effects coded to examine the linear component and then enter it again as a dummy/effect coded in the same model within the Ngene syntax ...