Cluster analysis cannot solve the problem of compositor of classifications in one collectivity, but grey relation analysis can accurately describe the connection of the classifications.

• 摘要聚类分析可以解决类与类之间的相似关系但不能解决同一类中优化排序的问题，而灰色关联分析法可有效描述因素间关系的强弱、大小和次序。