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Thank you very much for the support!

Dear Michiel,

thank you very much for your kind respond and the great explanation.
I worked more on the design and added additional waiting ("wt") and access times ("at"). In order to reduce the number of parameters to be estimated, I changed the number of env levels to 4 and made "b_at" common ...

Hello,
I am currently working on a design for a stated preference survey. There are 3 alternatives (different means of transport) and 3 attributes (3 levels each): in-vehicle travel time, waiting time and cost. I was thinking about adding another attribute corresponding to environmental impact with ...