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ForumAdmin Site Admin
Joined: May 20 2005 Posts: 120 Location: New Jersey
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Posted: Thu Mar 22, 2012 9:05 am Post subject: Two-Out-of-Five |
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Year 2021, see our updated webpage --> https://www.sims2000.com/Questionnaire-2-out-of-5.asp
Older information and method is shown below.
Two-Out-of-Five Test is a discrimination test presenting 5 products to the judge among which 2 are from one group and 3 are from another group. 2A 3B. Judges are asked to group the products into 2 groups usually based on similarity. Also known as a 2 Among 5 test, this test is used less often than the Triangle Test, Duo-Trio Test, or the paired-comparison tests.
Similar to a Two-Out-of-Four, aka Tetrad Test, a discrimination test presenting 4 products to the judge among which 2 are from one group and 2 are from another group. 2A 2B. See our webpage:
http://www.sims2000.com/Questionnaire-Tetrad.asp
Two-Out-of-Five test is generally not suitable for food products and flavors. Are you testing food or flavors?
Questionnaire Example: 2 of 5 example, Tetrad same but with 4 samples. The sample's order will appear randomized.
Experimental Design: Because this test is a little different than a typical discrimination test, the experimental design will also be a little different in setup. The ballot question as shown takes care of the presentation of your 2 actual samples. Setup a 5C5R1 experimental design, aka a five sample design, where each of these 5 is one of your 2 actual samples. Your Internal Sample DESCRIPTIONS must match 2 x 3 or 3 x 2
Pros & cons: Statistically robust, since the chances of guessing the 2/5 samples correctly is 1/10, rather than 1/3 as in the Triangle Test. Fewer panelists are often needed due to this boost in power – as few as 5 or 6 panelists can be used when expected differences are large enough. But not a good choice when carry-over and lingering aftertastes is an issue due to the high number of samples that need to be tasted.
Raw Data: Use Data Export to Excel to count your Correct & Incorrect panelist responses.
Stats: Two-Out-of-Five Test In the partial chart below 'n' signifies the number of assessments in the test, and .1/.05 represents the a-risk, match the a-risk you want with the number of assessments you have performed to find the minimum number of correct responses needed to show significance. For example, for 20 assessments at an a-risk of 0.05, you’d need 5 or more correct responses to show a significant difference.
Code: | alpha
n 0.1 0.05 n 0.1 0.05 n 0.1 0.05 n 0.1 0.05
3 2 2 10 3 4 17 4 5 24 5 6
4 2 3 11 3 4 18 4 5 25 5 6
5 2 3 12 4 4 19 5 5 30 6 7
6 3 3 13 4 4 20 5 5 60 10 11
7 3 3 14 4 4 21 5 6
8 3 3 15 4 5 22 5 6
9 3 4 16 4 5 23 5 6 | See complete statistical Table 17.14 Critical Number of Correct Responses in Two-out-of-Five Test,
Sensory Evaluation Techniques, 4th Edition, by Meilgaard, Civille, and Carr, page 439.
References:
Sensory Evaluation Techniques, Civille & Carr, 4th Edition, Chapter 6 Overall Difference Tests, page 80
More information:
https://www.sensorysociety.org/knowledge/sspwiki/Pages/Two-out-of-five%20Test.aspx
Last edited by ForumAdmin on Thu Apr 15, 2021 4:57 pm; edited 27 times in total |
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ForumAdmin Site Admin
Joined: May 20 2005 Posts: 120 Location: New Jersey
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Posted: Thu Jan 16, 2014 6:24 pm Post subject: Profiling |
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Example using Profiling in SIMS.
NOTE: This profile style is less used then the ABOVE Hedonics shown in previous post above.
Use the Tetrad Examples in above post.
Questionnaire Example:
Profile Ballot Setup Example:
Profile style allows for unique blinding codes for all panelists, if that is an absolute requirement.
Experimental Design: Setup a 4C4R1 experimental design, a four sample design.
[X] Enable Profiling.
This design gives you more control over to customize the presentation order of the samples. A permutations plan is randomized.
Run the test, then use the SIMS software frequency reports to pull your data.
Raw Data: Use Data Export to Excel to count your Correct & Incorrect panelist responses. Use the same XLS file shown previous post above and transfer the responses accordingly.
Stats: Same as above. Tetrad, Two-Out-of-Four Test See complete statistical Table 17.8 Critical Number of Correct Responses in Triangle Test,
Sensory Evaluation Techniques, 4th Edition, by Meilgaard, Civille, and Carr, page 433.
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