聚类分析,亦称群分析或点群分析,是研究多要素事物分类问题的数量方法。基本原理是根据样本自身的属性，用数学方法按照某种相似性或差异性指标，定量地确定样本之间的亲疏关系，并按这种亲疏关系程度对样本进行聚类(Cluster analysis, also called group analysis or point group analysis, is a quantitative method for studying the classification of multi factor things. The basic principle is based on the attribute of the sample itself, using mathematical methods according to some similarity or difference index to quantitatively determine the affinities between the samples, and with this kind of relation to sample clustering)