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=== 连接准则 Linkage criteria===

=== 连接准则 Linkage criteria===

连接标准决定了集合内簇之间的距离作为两个簇之间距离的函数。簇''A''和簇''B''之间一些常用的连接标准如下：<ref>{{cite web | title=The CLUSTER Procedure: Clustering Methods |url=https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/statug_cluster_sect012.htm | work=SAS/STAT 9.2 Users Guide | publisher= SAS Institute | date= | accessdate=2009-04-26}}</ref><ref>{{cite journal |last=Székely |first=G. J. |last2=Rizzo |first2=M. L. |year=2005 |title=Hierarchical clustering via Joint Between-Within Distances: Extending Ward's Minimum Variance Method |journal=Journal of Classification |volume=22 |issue=2 |pages=151–183 |doi=10.1007/s00357-005-0012-9 }}</ref>

连接标准决定了集合内簇之间的距离作为两个簇之间距离的函数。簇''A ''和簇''B ''之间一些常用的连接标准如下：<ref>{{cite web | title=The CLUSTER Procedure: Clustering Methods |url=https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/statug_cluster_sect012.htm | work=SAS/STAT 9.2 Users Guide | publisher= SAS Institute | date= | accessdate=2009-04-26}}</ref><ref>{{cite journal |last=Székely |first=G. J. |last2=Rizzo |first2=M. L. |year=2005 |title=Hierarchical clustering via Joint Between-Within Distances: Extending Ward's Minimum Variance Method |journal=Journal of Classification |volume=22 |issue=2 |pages=151–183 |doi=10.1007/s00357-005-0012-9 }}</ref>

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| 质心连接集群 Centroid linkage clustering （或UPGMC）

| 质心连接集群 Centroid linkage clustering （或UPGMC）

| <math> \|c_s - c_t \| </math>分别是 ''s''类和 ''t''类的中心.

| <math> \|c_s - c_t \| </math>分别是 ''s ''类和 ''t ''类的中心.

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| 最小能量聚类 [[Energy distance|Minimum energy clustering]]

| 最小能量聚类 [[Energy distance|Minimum energy clustering]]