ISO 5495-2005 感官分析.方法学.成对比较试验

标准号：ISO 5495-2005
中文标准名称：感官分析.方法学.成对比较试验
英文标准名称：Sensory analysis - Methodology - Paired comparison test
标准类型：X04
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：X04
国际标准分类号：67.240
适用范围：This International Standard describes a procedure for determining whether there exists a perceptible sensorydifference or a similarity between samples of two products concerning the intensity of a sensory attribute. Thistest 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.NOTE The paired comparison test is the simplest existing classification test since it concerns only two samples.The method is applicable whether a difference exists in a single sensory attribute or in several, which meansthat it enables determination of whether there exists a perceptible difference concerning a given attribute, andthe 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 anydifference between the two products.This method is only applicable if the products are relatively homogeneous.The method is effectivea) for determining⎯ whether a perceptible difference exists (paired difference test), or⎯ whether no perceptible difference exists (paired similarity test) when, for example, modifications aremade to ingredients, processing, packaging, handling or storage operations, orb) for selecting, training and monitoring assessors.It is necessary to know, prior to carrying out the test, whether the test is a one-sided test (the test supervisorknows a priori the direction of the difference, and the alternative hypothesis corresponds to the existence of adifference in the expected direction) or a two-sided test (the test supervisor does not have any a prioriknowledge concerning the direction of the difference, and the alternative hypothesis corresponds to theexistence of a difference in one direction or the other).