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。
Methods: After selecting 20 normal foods in northern China, 8 nutrients were examined with hierarchical cluster analysis.
方向数据的聚类分析法对与疾病的时间聚集性进行分析、季节分层分类等有极其重要的意义。
Cluster analysis of directional data is important to temporal clustering analysis of disease and stratification of season.
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