http://spssx-discussion.165.s1.nabble.com/statistical-differences-between-products-evaluation-using-incomplete-block-design-tp4852186p4854155.html
UNIANOVA with your data as as showed you in the example I sent. I forgot
> Dear Marta,
>
> Could you be so kind in order to help me interpreting the results?
>
>
> -----Original Message-----
> From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
> Marta García-Granero
> Sent: Thursday, September 29, 2011 12:17 PM
> To:
[hidden email]
> Subject: Re: statistical differences between products evaluation using
> incomplete block design
>
> El 29/09/2011 9:53, Alexandra Chirilov escribió:
>> 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)?
> Hi Alexandra:
>
> Time ago I managed to replicate the results for this balanced incomplete
> block design I found in a book, using SPSS:
>
> Fert. Bl.1 Bl.2 Bl.3 Bl.4 Bl.5
> F1 94 96 100 92 -
> F2 95 75 76 - 92
> F3 76 100 - 97 98
> F4 94 - 102 93 96
> F5 - 75 91 86 95
>
> * Dataset *
> data list list/Block Fert Yield (3 F8.0).
> begin data
> 1 1 94
> 2 1 96
> 3 1 100
> 4 1 92
> 1 2 95
> 2 2 75
> 3 2 76
> 5 2 92
> 1 3 76
> 2 3 100
> 4 3 97
> 5 3 98
> 1 4 94
> 3 4 102
> 4 4 93
> 5 4 96
> 2 5 75
> 3 5 91
> 4 5 86
> 5 5 95
> end data.
>
> *Analysis *.
> UNIANOVA
> Yield BY Fert Block
> /RANDOM = Block
> /METHOD = SSTYPE(1)
> /INTERCEPT = INCLUDE
> /DESIGN = Block Fert.
>
> It is important:
>
> - Use SSTYPE(1) instead of the default method - SSTYPE(3)
> - The order of both factors in "/DESIGN" (last line) is blocks first, then
> treatments
>
> HTH,
> Marta GG
>
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