Hierarchical cluster analysis was used to evaluate the quality.
系统聚类分析法对质量进行归类。
Hierarchical cluster analysis implied that the hooking rate bears the closest relation to nutrient salt.
聚类分析表明，钓获率与营养盐关系最为密切。
Methods: After selecting 20 normal foods in northern China, 8 nutrients were examined with hierarchical cluster analysis.
方法：选取北方常见的20种食物，根据其8种主要营养素含量进行分层聚类分析。
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