第一吗步，采用聚类分析法，利用1990年、2000年资料，对山东省17地市进行社会经济类型的分类，均划分为3个类型。
First step, adopting Cluster Analysis Method and utilizing data in 1990 and 2000, 17 regions in Shandong Province has been classified into 3 types according to society - economic type.
根据大量实地调查样地资料，对贵州喀斯特灌丛群落进行组平均法的数量分类，将贵州喀斯特灌丛划分为13个类型，并对主要类型的生境条件、群落特征及分布等作了论述。
According to a great deal data of the sample survey, the author, using group-average, classify Karst scrub community in Guizhou Province into 13 type and elaborate main types.
依据大量的调查资料，应用有序样本聚类方法，按林分类型、立地条件和林龄来确定次生林改造生长量划分标准；
Based on a large amount of investigating data, the authors use cluster analysis method with ordered samples to set dividing standards for the growth rate of secondary forests rechange.
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