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Thank you very much.

Dear Michiel,

Apologies for another question but I just wanted to clarify that manually swapping choice tasks across blocks would only affect attribute level balance, and not identification or efficiency or any other design properties?

While I understand that it is not possible to achieve a high ...

Thank you very much for going through the script and for the explanation.

Thank you so much for the clear explanation, I appreciate it very much. I tried the different options suggested with the ;block property but am still unable to achieve balance within blocks.

The design is a labelled design with three alternatives and an opt-out. There are a total of 6 attributes ...

Thanks very much for the explanation. Are these methods only relevant when using the modified Federov algorithm? I'm using the column-based swapping algorithm and was wondering if adding the "imbalance" property to the objective function could improve attribute-level balance within blocks.

I have another follow-up question on attribute-level balance. I'm trying to understand what the option "imbalance" in the Ngene syntax aims to do. Is that an option to minimise any potential imbalance in a design? For example, the syntax "eff = (mnl,d) + 0.5*(imbalance)".

Hi Michiel,

Thank you very much for your explanation. It's reassuring to know that attribute level balance is not a strict requirement. I may adjust some of the choice tasks manually within blocks to achieve better balance.

Best,
Ashani

Hi,

I'm designing a labelled discrete choice experiment with six attributes, with levels ranging from 2-4. The design currently has a total of 72 rows, where each respondent will be given 8 choice sets each from 9 blocks. While 12 choice sets per individual would be the best for full attribute ...