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Thank you both for your opinion on this!

Best,
Gaëlle

Dear choice modellers,

I have a general question regarding sampling procedure for choice experiments.

I am considering rewarding my participants (who are winegrowers) for accepting to answer, face to face, my choice experiment, the reward being of a value of 15 euros. Is it common to incentivize ...

Will change that, thank you Michiel for your help!
I am now ready for the collection of the main data

Great, the code works now, thanks Michiel.

Just to double-check before I select a design and put it into Survey Engine, is my code below fine? Or would you advise me to change anything else?
I changed bdraws to halton type of distribution as I also changed mean to median now for drawing the ...

Hi Michiel,

Thank you for your answer and spotting that I missed a D in the script ...
I have now edited my priors for the cost and cost interaction attributes accordingly.

The levels of my status quo alternative are all specific to my status quo (as being zero) EXCEPT for the first attribute as ...

Hi Michiel,

These are not chosen priors but the priors I obtained from my pilot test on 25 respondents.

Here are below the results I get with the constant being the one for the status quo/alt3 . However, what might be an issue is the way the data is coded for my 3rd alternative which is a status ...

Hi Michiel,

Thank you for your answer!
Very good point, I am actually not 100% sure whether I have a status quo or an opt out alternative. What I did in SurveyEngine is that I wrote in the survey to my respondents what each attribute meant for the status quo, so for instance, that choosing the ...

Dear Ngene users,

I am running the code below and Ngene is taking a long time to find a design. It only found one design with undefined D error after a few minutes and then it still runs without suggesting other designs.
Am I doing something wrong in my code? Should I not run this code through a ...

Dear choice modelers,

I have been collecting data for my pilot test with 25 respondents and I would like to extract priors to estimate an efficient Bayesian design for the final data collection.

I am a bit unsure which model I should keep to extract my priors from. Below, the first model without ...

Hi John,

Thank you so much for your detailed answer and your encouragements!

I have an aditional question. This is about the prior I should use for the ASC/ intercept which is coded as b0[0] in my Ngene model: What estimate should I retrieve from the results I showed in my post? Is it the ...