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Thank you so much for your insightful and informative response.
I will consider research methods based on your advice.

Dear all,

I am considering a study to estimate the partial utility of each attribute by asking respondents to directly answer the utility for health states that combine multiple attributes with multiple levels.
In such a study, can Ngene be used to create an efficient set of health states to be ...

Thank you very much for your quick response.

Thank you for a very kind answer.
If you don't mind, I would like to know about the design and D-error when rows = 18.
Thank you and best regards,

I am trying to adopt the D-optimal design for 8 attributes with 3 choices.
I get an "out of memory" error when I run the following code:

Design
;alts = alt1, alt2
;rows = 27
;orth = ood
;model:
U(alt1) = b1 + b2 * A[1, 2, 3] + b3 * B[1, 2, 3] + b4 * C[1, 2, 3] + b5 * D[1, 2, 3]
+ b6 * E[1, 2, 3 ...