Re: statistical differences between products evaluation using incomplete block design

Posted by Bruce Weaver on Sep 29, 2011; 4:43pm
URL: http://spssx-discussion.165.s1.nabble.com/statistical-differences-between-products-evaluation-using-incomplete-block-design-tp4852186p4853938.html

Yep, I do remember going to the book stacks in a library (with poor air circulation) to find such things.  On account of the poor air circulation, you could only stay for so long before dropping off to sleep.  

The first link was meant to be this:

  http://www.iasri.res.in/iasriwebsite/DESIGNOFEXPAPPLICATION/Electronic-Book/

David Marso wrote

GREAT find Bruce.
BTW: First link is broken ;-(
I Located that same site when I Googled Incomplete Block Design.
Useful information!  Do you recall the times before the availability of the internet when we had to locate such things in Books ;-)
--

Bruce Weaver wrote

That looks like it's from the same site I stumbled across a week or two ago.  Here are some more potentially useful links:

  http://www.iasri.res.in/iasriwebsite...ectronic-Book/
  http://www.iasri.res.in/ebook/ebooks.htm

David Marso wrote

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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