NF EN ISO 5495
Sensory analysis - Methodology - Paired comparison test
Le présent document décrit un mode opératoire permettant de déterminer s'il existe une différence sensorielle perceptible ou une similitude entre les échantillons de deux produits sur l'intensité d'une propriété sensorielle.
Le présent document décrit un mode opératoire permettant de déterminer s'il existe une différence sensorielle perceptible ou une similitude entre les échantillons de deux produits sur l'intensité d'une propriété sensorielle.
<p>ISO 5495:2005 describes a procedure for determining whether there exists a perceptible sensory difference or a similarity between samples of two products concerning the intensity of a sensory attribute. This test is sometimes also referred to as a directional difference test or a 2-AFC test (Alternative Forced Choice). In fact, the paired comparison test is a forced choice test between two alternatives.</p> <p>The method is applicable whether a difference exists in a single sensory attribute or in several, which means that it enables determination of whether there exists a perceptible difference concerning a given attribute, and the specification of the direction of difference, but it does not give any indication of the extent of that difference. The absence of difference for the attribute under study does not signify that there does not exist any difference between the two products.</p> <p>This method is only applicable if the products are relatively homogeneous.</p> <p>The method is effective (1) for determining whether a perceptible difference exists (paired difference test), or whether no perceptible difference exists (paired similarity test) when, for example, modifications are made to ingredients, processing, packaging, handling or storage operations, or (2) for selecting, training and monitoring assessors.</p> <p>It is necessary to know, prior to carrying out the test, whether the test is a one-sided test (the test supervisor knows a priori<i> </i>the direction of the difference, and the alternative hypothesis corresponds to the existence of a difference in the expected direction) or a two-sided test (the test supervisor does not have any a priori knowledge concerning the direction of the difference, and the alternative hypothesis corresponds to the existence of a difference in one direction or the other).</p>
- Avant-proposiv
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1 Domaine d'application1
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2 Références normatives2
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3 Termes et définitions3
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4 Principe4
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5 Conditions générales de l'essai4
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6 Sujets5
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6.1 Qualification5
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6.2 Nombre de sujets5
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7 Mode opératoire5
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8 Analyse et interprétation des résultats6
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8.1 Lors d'un essai de différence6
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8.2 Lors d'un essai de similitude7
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9 Rapport7
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10 Fidélité et erreurs systématiques8
- Annexe A (normative) Tableaux9
- Annexe B (informative) Exemples16
- Bibliographie23
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