聚类分析是一种探索性的分析，在分类的过程中，人们不必事先给出一个分类的标准，聚类分析能够从样本数据出发，自动进行分类。聚类分析所使用方法的不同，常常会得到不同的结论。不同研究者对于同一组数据进行聚类分析，所得到的聚类数未必一致(Clustering analysis is an exploratory analysis. In the process of classification, people do not have to give a classification standard in advance. Clustering analysis can automatically classify samples from sample data. The different methods used in cluster analysis often get different conclusions. Different researchers cluster analysis on the same group of data, the number of clustering obtained is not necessarily consistent)