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04-04-08-10+analyticalsensory_difftests

# 04-04-08-10+analyticalsensory_difftests - WHICH SENSORY...

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3/4/2010 VEN125 Spring 2003 1 Analytical Sensory Evaluation Discrimination Tests Ven 125 Hildegarde Heymann WHICH SENSORY TEST TO USE? WHAT IS THE PURPOSE? This wine tastes funny... Which vineyard is higher quality... What is the threshold for…. SELECT SPECIFIC SENSORY TEST(s) TO ANSWER SPECIFIC QUESTION(s)…. TYPES OF SENSORY TESTS Difference Tests Is there a difference? Duo-trio Triangle Pair Direction of difference…… ytical Ranking Tests Sequence or order of the difference? Intensity Rating Tests How large is the difference? Time Intensity Tests How does it change over time? Descriptive Analysis What is different and by how much? Consumer Tests How much is it liked or preferred? Analy Consumer Types of Difference Tests Unspecified difference Specified difference A-not-A Directional Pair (2AFC)* Same/different 3AFC* Duo-Trio Triangle 2 out of 5 (For screening only) *Rare in food/wine Unspecified difference Duo trio Which is same as (most similar to) “Ref”? 314 854 REF Difference tests Triangle Which is sample is odd? Specified difference (Rarely useful….) Directional pair test Which is sweeter? 114 592 673 298 547 Unspecified difference Duo trio p = 1/2 (one tail) T iangle Probability for each test 314 854 REF Triangle P = 1/3 (one tail) Specified difference (Directional pair test) p = 1/2 (one tail) 114 592 673 298 547

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