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Do all ASCs need to appear in every choice set?


I'm wondering if in an alt-specific design does each ASC and it's related attribute levels have to appear in every choice set? Say I have 7 possible alternatives/concepts, but for the sake of saving space and cognitive load I only want to display 4 and none option (for the instance where the respondent's preferred alternative is not displayed, say they drive but car isn't an option displayed). With a sufficient sample is there any issue with this approach from a statistical perspective?
asked Mar 8 by Jasha Bowe Bronze (1,680 points)
retagged Mar 8 by Walter Williams

1 Answer

+1 vote
Best answer

There is no reason all the alternatives need to appear in all choice sets.  There are whole classes of such designs dating back to the early 1990s called availability designs.
answered Mar 8 by Keith Chrzan Gold Sawtooth Software, Inc. (48,525 points)
selected Mar 8 by Jasha Bowe