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2-AFC (Alternative Forced Choice)

 
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Jane



Joined: Dec 21 2005
Posts: 5

PostPosted: Wed May 02, 2007 7:12 pm    Post subject: 2-AFC (Alternative Forced Choice) Reply with quote

How do I set up a 2-AFC (Alternative Forced Choice) Test in SIMS 2000?

Thanks,
Mary
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John



Joined: Jun 13 2005
Posts: 23

PostPosted: Wed May 02, 2007 7:22 pm    Post subject: Reply with quote

Hi Jane -

2-AFC (Alternative Forced Choice) is also commonly referred to as a Paired Comparison Test. Use this method to test for sensory differences between two samples, such as 'which sample is sweeter'.

In SIMS 2000, set up your 2-AFC as a Paired Comparison test, with PC or PCN, where an answer is forced or not forced. For reports see the SIMS 2000 Paired Comparison Attribute Analysis, in addition to the other available reports.

SIMS includes great report options Paired Comparison tests:
http://www.sims2000.com/ReportsShowPairedComparisonAttributeAnalysis.asp

Reference #1:
Sensory Evaluation Techniques,
Civille, 3rd Ed.(pg 100), 2nd Ed.(pg 100)

Reference #2:
ASTM E2164-01 Standard Test Method for Directional Difference Test
1.1 This Test Method covers a procedure for comparing two products using a two-alternative forced-choice task.
1.2 This method is sometimes referred to as a paired comparison test or as a 2-AFC (alternative forced choice) test.
1.3 A directional difference test determines whether a difference exists in the perceived intensity of a specified sensory attribute between two samples.


John
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