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Minimum number of Versions

Is there a way to calculate minimum reasonable number of CBC versions for survey?
I have not less than 200 respondents, and can change the number of tasks, alternatives, etc., but have to generate a design with very few number of versions (5-10).
How can I define that minimum number?
asked Mar 14 by pipo (165 points)

1 Answer

0 votes
If you are using our software, create the design using different numbers of versions (5, 7, 10) and run the design test.  Take a look at the standard errors you're getting for your main effects and for any interactions you might be interested in running (rule of thumb is we'd like to see standard errors for main effects at 0.05 or lower and for interactions at 0.10 or lower).   

If you can achieve that with a smaller number of versions, then by all means use that smaller number.
answered Mar 14 by Keith Chrzan Platinum Sawtooth Software, Inc. (73,175 points)
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