Hi..
I am facing a difficulty in deciding the attribute levels of some of the attributes considered for alternative specific experiment.
Lets say, Alternative A is likely to have a utility higher than Alternative B (i.e. considering all attributes considered in the design).
Now, there is an attribute x (lets say cost) that is likely to be negatively correlated with the utility of both the alternatives.
There are some other attributes as well, apart from x.
Assumed levels for attribute x are as follows:
(1.) Alternative A: 6, 8 and 10
(2.) Alternative B: 4, 6 and 8
Now, If a few (lets say 2 to 4) of the total 24 choice sets have attribute x's values as, 6 (for Alternative A: the better alternative) and 8 (for Alternative B), it might not look realistic to respondents.
Please advise, if this sort of choice set is okay to be considered? [Note: I have seen a study published in a reputable journal with this sort of choice set present among the total choice sets, however I am wondering if it is a major problem, or it is very common to have one or a few choice sets like that being present].
If this is a major issue, please advise, how to avoid such choice sets from being generated by the design.
Cheers