production dement denseness degree

• 聚类分析法

production dement denseness degree的用法和样例：

例句

1. The association coefficient was taken for the similar degree of amphibians in every two zoogeographical zones.The cluster analysis was taken by group average method.
   建立物种有无分布的二元数据列联表，利用联合系数表示每两个地理小区内两栖动物的相似程度，以类平均法进行了聚类分析。