基于秩相关与聚类分析的评价员排序能力评估

将最常用的甜、酸基本味分别设置成6个浓度体系作为评价员排序能力筛选的参比样,考虑到感官疲劳的客观现象,12位评价员对每个味道系列浓度进行3次重复排序,在分别采用Spearman检验和Kendall检验评估评价员排序正确性与重复性的基础上,采用聚类分析融合正确性与重复性数据特征,综合评估分析每位评价员的排序能力。发现5号评价员表现最差需要剔除;3号评价员需要进一步训练;6位评价员(编号为2、4、9、10、11、12号)排序能力表现优异,可直接开展检测试验;4位评价员(编号为1、6、7、8号)排序能力良好。同时发现Kendall检验系数W值与Spearman检验系数rs平均值具有整体正相关趋势,而W值能更精确区分评价员之间的能力差异。该研究可为感官分析实验室中评价员的筛选与维护提供理论依据和实践经验。

Study on ranking ability evaluation for sensory assessors based on rank correlation andcluster analysis

The commonly used tastes of sweet and sour were respectively set to six concentrations system as the test samples for ranking ability screening of sensory assessors. In consideration of the sensory adaption, 12 assessors were asked to rank three times to each taste. Firstly, the accuracy of every assessor was evaluated by Spearman test. And Kendall test was used to evaluate the repeatability of the assessor. Finally, the ranking ability of each assessor was evaluated and analyzed comprehensively through fusion the data characteristics of accuracy and repeatability by clustering analysis. The results were showed that No. 5 assessor need to be eliminated for his poor performance and No. 3 assessor need to be trained more, while No. 1, 6, 7, 8 assessors showed good ranking ability and No. 2, 4, 9, 10, 11, 12 could directly carry out the test because of their excellent ranking ability. It was also found that W value of Kendall test and r_s value of Spearman test were overall positively related. However, W value of Kendall test could distinguish the ability more accurately among assessors. This paper provides theoretical guidance and practical experience for assessor screening and maintenance in sensory analysis laboratory.