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Dear Michel,

Thanks for your help. It actually works. However, the results also show more appearence contract = 1, compared with contract = 2 or 3, while we set the 6-10 times for the apperance of each contract.

My only concern is that respondents have strong preferences for contract = 2 and ...

Dear Michiel,

Thanks a lot! It actually works. This issue here:

The modified Federov algorithm will not satisfy attribute level balance, so you may see that the middle levels are not used much for the numerical attributes. To resolve this, you could add attribute level constraints, e.g. (5-10,5 ...

Code

design
;alts = opt1*, opt2*, opt3*
;block = 1
? efficient design
;eff = (mnl, d)
;rows = 27
;cond:
if(opt1.contract = 1, opt1.plug_in_hours = [90,120,150]),
if(opt1.contract = 1, opt1.rewards1 = [50,110,170]),
if(opt1.contract = 1, opt1.rewards2 = 0),
if(opt1.contract = 1, opt1 ...