Re: statistical differences between products evaluation using incomplete block design

Posted by David Marso on Sep 29, 2011; 12:35pm
URL: http://spssx-discussion.165.s1.nabble.com/statistical-differences-between-products-evaluation-using-incomplete-block-design-tp4852186p4852902.html

A quick calculation gives 20 combinations of 6 choose 3.
I hope you have counterbalanced the order of product presentation!!!
Hopefully the following will be useful/helpful.
http://tinyurl.com/3czcalr
----Resolves to this mess----
You'll likely need to save to disk as the doc does not seem to open from the redirect.
( FWIW:  I am on Mac Leopard running FireFox 6.0.2)
Maybe this link directly will work better than the tinyurl but it is ugly
http://www.google.com/url?sa=t&rct=j&q=2bibd.pdf&source=web&cd=1&ved=0CBoQFjAA&url=http%3A%2F%2Fwww.iasri.res.in%2Fiasriwebsite%2FDESIGNOFEXPAPPLICATION%2FElectronic-Book%2FModule%25202%2F2BIBD.pdf

Alexandra Chirilov wrote

Dear list,

I have a problem...one of our client wants to evaluate 6 products in a CLT!
We propose him a balance incomplete block design (BIBD) (3 products per
respondents). I generate a quite balance design (D-efficiency = 0.8).

I have never used before BIBD (I used only complete design) and I don't have
any idea how to statistically compare the products' evaluation? What
statistical test should I use in order to say that product A is better
perceived than product B (e.g.: 8.97 significantly higher than 8.80)?


Thank you very much,
Alex

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