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Many samples, shown in random Pairs ?

 
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Jane



Joined: Dec 21 2005
Posts: 5

PostPosted: Fri May 26, 2006 10:28 am    Post subject: Many samples, shown in random Pairs ? Reply with quote


Many samples, shown in random Pairs ?

We want to do a Split Plate sample study, where our samples are presented in pairs, random and balanced pairs. We want each panelist to see all possible pairs. We have 10 samples. One pair per day per panelist. We know it going to be a long and important study, we just want to make sure we do it right. Can you help? Any comments or hints are appreciated.

Thanks, Jane
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Karen



Joined: May 26 2006
Posts: 3

PostPosted: Fri May 26, 2006 2:01 pm    Post subject: Reply with quote


Hi Jane -

Your study has 10 samples, presented in sample pairs to the panelists. This is a 10C2 Experimental Design. You said you'd like every panelist to see every possible pair, which is 45 pairs.


Setup your SIMS 2000 Experimental Design as a 10C2 R45. This is 10 Samples, Presenting 2, 45 Reps. You'll need an Experimental Plan which has exactly 45 Blocks. Good news, SIMS 2000 already has a built in Experimental Plan that should fit perfectly.
    COCHRAN & COX, PLAN 11.14
      Number of Samples............: 10
      Number of Reps in Plan.......: 1
      Number of Blocks.............: 45
      Number Presented.............: 2

45 possible pairs...:

Steps:

1. Create your ballot/questionnaire. Standard layout, questions seen "with all samples".

2. Create your SIMS 2000 Experimental Design with 10 samples, 45 Reps, n panelists/respondents.
    Also Select:
      Block Presentation: As In Plan
      Sample Presentation: Randomized

See Sample Information Tab, keep it simple by selecting Same Blinding Codes for Reps and Same Blinding Codes Panelists. You'll have 10 unique Blinding Codes.

(Optional, maybe you want to present your ballot in Profile Mode. Profile Mode allows responses in any sample/attribute order. See Picture #11 & #12: http://www.SensoryComputerSystems.com/SIMSNetmeet/ )

3. Create your SIMS 2000 Test Definition.
Please review Rotation Plan report for acceptability.

4. Create your SIMS 2000 Test Data Result Master.
All of your panelists will see all 45 pairs, and will only be doing one pair of samples per day. Chances are that your panelists will be doing the study in varying progress, some ahead of others by a number of days.
Therefore, Execute the Test with:
Select 'Allow Continuous Presentation Over Reps'
(which will automatically set 'Force All Panelists to Exit After Every 2 Samples')


Pretty good looking Experimental Design. Balanced and near perfect rotation of presentation orders. Of course you may opt for less randomization when creating your design. Just be sure to validate your rotation plan report to your expectations.

Code:
 
-->  ROTATION PLAN - ACCEPTABLY BALANCED  !  <--
            (tolerance=1)

           Pos 1    Pos 2    Totals
           -------  -------  ------- 
Sample1       13       14       27
Sample2       13       14       27
Sample3       14       13       27
Sample4       14       13       27
Sample5       14       13       27
Sample6       13       14       27
Sample7       14       13       27
Sample8       14       13       27
Sample9       13       14       27
Sample10      13       14       27

Please pre-test everything prior to your Live test.

Supportively yours,

Karen
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