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fixed task % and simulated $ don't match

I have fixed task % for three goods and none as 25%, 13%, 55% and 9%. But the simulation % for them are 35%, 16%, 39%, 10%. Why the inconsistency? Also, simulation shows a low price sensitivity but fixed tasks who most people go for the product with lowest price.

Thanks!
asked Nov 14 by Xiaowen (460 points)

1 Answer

0 votes
Remember that the model you build takes into account the entire choice exercise, so it's not guaranteed that it's going to perfectly predict one particular scenario.  Most of the time you would probably want to have multiple fixed tasks and look at the shared error between the model and the fixed tasks.  This paper has a nice overview of thinking about fixed tasks: https://sawtoothsoftware.com/resources/technical-papers/including-holdout-choice-tasks-in-conjoint-studies

It's difficult to comment much deeper without understanding anything about your exercise, design choices, etc.  But, there are some things you can do like test interactions, apply constraints, etc. but it's kind of hard to recommend changing your model to ignore the main exercise tasks less just to try to get closer to fitting 1 of the fixed tasks.
answered Nov 16 by Brian McEwan Gold Sawtooth Software, Inc. (48,600 points)
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