感官分析 方法 顺序分析（ISO 16820:2019 identical）

[中文适用范围]： 该方法涉及三角测试、二-三角测试、三项选择强制比较（3-AFC）及两项选择强制比较（2-AFC）等判别测试。在每次测试后，即可决定是否终止测试并判定存在差异、终止测试并判定无差异，或继续测试。序贯法通常可在较少的判别测试次数后作出结论，而传统方法需依据预设的评估数量进行测试。该方法适用于：a）判定以下两种情况之一：1）是否存在可感知的差异；2）在原料、加工工艺、包装、处理或储存等环节发生变更后，是否不存在可感知的差异；b）评估员的选择、培训与监控。 [外文原描述]： This document specifies a procedure for statistically analysing data from forced-choice sensory discrimination tests, such as the triangle, duo-trio, 3-AFC, 2-AFC, in which after every trial of the discrimination test the decision can be made to stop testing and declare a difference, to stop testing and declare no difference, or to continue testing. The sequential method often allows for a decision to be made after fewer trials of the discrimination test than would be required by conventional approaches that use predetermined numbers of assessments. The method is effective for: a) determining that either: a perceptible difference results; or a perceptible difference does not result when, for example, a change is made in ingredients, processing, packaging, handling or storage; b) selecting, training and monitoring assessors. N