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Hello again,
Apologies for the continued need for assistance here, but after discussing with the PI on this project today, we'd like to introduce a constraint so that the clean maize is always more expensive than the moldy (and we will insert a 7th question as a rationality check where clean is ...

Oh no, I've run into a problem with the code in my recent post. All the alternatives have the clean choice at a lower price than moldy, which would result in all respondents always choosing the clean and cheaper option. I guess I need to impose more constraints on the design so that this doesn't ...

Thank you both again so very much. Here is where I am moving:
1. Michiel's model is more appropriate to our context because we expect WTP to be different in the two seasons
2. We do want a third option that would be "buy none" because opting out of the market and potentially going hungry is a real ...

Thank you again so much! I do want to have a "no choice" option, I forgot about that in my original post. I have to admit I'm outside my league here, I'm not sure I really understand the difference between what Michiel has described and John's earlier code that had me generate 2 different designs ...

Dear John,
I cannot thank you enough! This was so incredibly helpful and exactly what I was needing. I am going to use your second option with 2 completely different designs because we will actually ask all respondents to answer in reference to both seasons, but are going to randomize the order of ...

Hello,
I am brand new to choice experiments and Ngene and am trying to generate a design for a simple situation. Here is the context: we are conducting a survey in rural Malawi on exposure to a toxic metabolite produced by mold on maize (corn). We have the following conditions:
1. Sample size is 360 ...