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我们曾于1978年对云南省江边林业局大平寨林场进行了群内单元数相等的成群分层点抽样调查,现将情况报告如下。 (一) 概念根据层化小班的区划条件,将总体划分为若干层。在层内随机,层间独立的组织样本。以分层抽样的每个样点为起点,按定向、定距又作m个辅助点,由(m+1)个点组成一群。如遇跨层,则按予先规定的原则处理,使其群内单元数都相等。群内每个点上进行角规测树
In 1978, we conducted a cluster sampling survey on the same unit population in Dapinzhai Forest Farm of Waterfront Forestry Bureau of Yunnan Province. The report is as follows. (A) Concept According to the zoning of stratified sub-class conditions, will be divided into several layers. Random, interlaminar tissue samples within the layers. To stratified sampling of each sample as a starting point, according to the orientation, distance and make m auxiliary points, by a group of (m +1) points. In case of cross-layer, according to the principle of pre-specified to make the number of units within the group are equal. Angle measurement tree at each point in the group