Three mostly used linkage criteria for the hierarchical clustering.

To calculate the pairwise distances for the hierarchical clustering, three commonly used linkage criteria were taken from the Wikipedia (http://en.wikipedia.org/wiki/Hierarchical_clustering).Three mostly used linkage criteria for the hierarchical clustering.为计算层次聚类（hierarchical clustering）的成对距离，我们从维基百科（http://en.wikipedia.org/wiki/Hierarchical_clustering）选取了三种常用的联结准则。三种最常用于层次聚类的联结准则。