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CBC Design

By Chao Wang | Jun 26, 2017 05:04PM CEST

Hi,

I want to understand how to decide on the maximum number of profiles, maximum number of comparison and number of profiles per comparison for CBC design. Besides, I also want to understand whether xlstat allows me to set up prohibited pairs in the design.

Thanks,
Chao

Best Answer
By Sébastien | Jun 27, 2017 11:02AM CEST | XLSTAT Agent

Dear Chao,

Sorry for getting back to you only now.
I’ve been doing some research about your query. Here’s what I found. As profiles are generated using fractional factorial designs, the best way to choose the number of profiles is to follow the fractional factorial design theory. For instance, you may find recommendations here for 2-level attributes: http://www.itl.nist.gov/div898/handbook/pri/section3/pri3347.htm
In this page, the number of factors corresponds to the number of attributes and the number of runs to the number of profiles.

Regarding your other questions, we usually recommend between 3 and 5 choices per comparison and between 8 and 20 comparisons in total. In this case, if you want to be optimal as well, you should be following Balanced Incomplete Block Design recommendations. In this case, profiles are treatments and questions are blocks.

XLSTAT does not allow you to choose prohibited pairs, unfortunately. However, I would suggest that you create this idea on our platform and vote for it: ideas.xlstat.com

Best,

Jean Paul


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By Sébastien | Jun 27, 2017 11:02AM CEST | XLSTAT Agent

Dear Chao,

Sorry for getting back to you only now.
I’ve been doing some research about your query. Here’s what I found. As profiles are generated using fractional factorial designs, the best way to choose the number of profiles is to follow the fractional factorial design theory. For instance, you may find recommendations here for 2-level attributes: http://www.itl.nist.gov/div898/handbook/pri/section3/pri3347.htm
In this page, the number of factors corresponds to the number of attributes and the number of runs to the number of profiles.

Regarding your other questions, we usually recommend between 3 and 5 choices per comparison and between 8 and 20 comparisons in total. In this case, if you want to be optimal as well, you should be following Balanced Incomplete Block Design recommendations. In this case, profiles are treatments and questions are blocks.

XLSTAT does not allow you to choose prohibited pairs, unfortunately. However, I would suggest that you create this idea on our platform and vote for it: ideas.xlstat.com

Best,

Jean Paul

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