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Dear Michiel,
Thank you so much for your help.
The final Bayesian design seems perfect!

Thanks again
Elisa

Dear all,

after collecting pilot data (based on an Efficient design) I am now in the process to design the final Bayesian design, and I have concerns on how to deal with insignificant coefficient estimates.
More in detail, from the MNL estimates I obtained all significant coefficients, except for ...

Dear Michiel,

sorry for this delay in anwering. I was out of office and I was able to run your codes only this morning. Everything looks fine now.
Thank you so much for your kind help.

Eli

Dear Michiel,
Thank you so much for your prompt response and suggestions.

First of all, I modified the intervals for calories making them larger to avoid the significance issue you mentioned. Ranges are not as wide as you suggested, but they reflect the actual calorie values of these products. I ...

Dear Ngene team,

I have estimated an efficent design setting all priors at zero. This design will be used for a pilot study to obtain the priors for a Bayesian design.
Below the attribute descriptions and the sintax I used.

Attribute description:
b1 = price (1.80, 2.20, 2.60, 3.00, 3.40, 3.80 ...

Dear Michiel,

thank you very much for your clarification. Given the type of product considered, 7 levels for the price attribute is indeed the best option... so I used the modified Federov algorithm and obtained a design with S-estimate=29, which seems ok.

Thanks again for your kind help. Much ...

Dear Michiel and Ngene team,

here I am again asking for your kind help to complete my bayesian design... After collecting pilot data using the codes reported in my previous posts, I ran a mnl and got my priors (all beta values were significant). Then, I divided all betas and std errors by 2 and ...

Thank you so much Michiel!
Eli

Dear Michiel,

I'm sorry to disturb you again, but I have a further question.
I just ran the design, but checking the output I found some repetitions (same choice situation in block 1 and 3). So I added the star to alt1 and alt2 as follows:

Design
;alts = alt1*, alt2*, alt3
;rows = 28
;block = 4 ...

Michiel,

thank you very much for your kind and prompt reply. Your suggestions really help!

Thanks again,
Eli