| 两阶群团抽样在森林调查中的估计效率研究 |
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| 引用本文： | 曾伟生,骆期邦,彭长清.两阶群团抽样在森林调查中的估计效率研究[J].林业科学研究,1995,8(5):483-488. |
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| 作者姓名： | 曾伟生 骆期邦 彭长清 |
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| 作者单位： | 长沙林业部中南林业调查规划设计院 长沙 410014;长沙林业部中南林业调查规划设计院 长沙 410014;长沙林业部中南林业调查规划设计院 长沙 410014 |
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| 摘 要： | 从两阶群团抽样的概念入手，根据两阶群团抽样当群团之间不存在差异成分时与系统抽样或简单随机抽样具有相同的抽样效率的性质，定义了误差扩大因子，提出了效率系数的概念，并推导出了效率系数等于１的临界状态的相关系数ｒ的表达式，为群团抽样设计和效率评估提供了重要依据。
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| 关 键 词： | 两阶群团抽样，误差扩大因子，效率系数，群内相关系数 |
| 收稿时间： | 1994/12/7 0:00:00 |
Study on Efficiency of Two-Stage Cluster Sampling in Forest Inventory |
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| Zeng Weisheng,Luo Qibang and Peng Changqing.Study on Efficiency of Two-Stage Cluster Sampling in Forest Inventory[J].Forest Research,1995,8(5):483-488. |
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| Authors: | Zeng Weisheng Luo Qibang and Peng Changqing |
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| Institution: | South-Central Forest Inventory & Planning Institute Changsha 410014;South-Central Forest Inventory & Planning Institute Changsha 410014;South-Central Forest Inventory & Planning Institute Changsha 410014 |
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| Abstract: | According to the special feature that two-stage cluster sampling has the same efficiency as the systematic sampling or simple random sampling when there are no differences among clusters,the term of error expansion factor is presented in this paper. Besides the correlation coefficient for critical state,when efficiency coefficient equals to l,is formulated,which provide important reference of implementing cluster sampling design and sampling efficiency assessment.In addition,the relationship between efficiency of two-stage cluster sampling and distance between plots in a cluster is further studied with an example demonstrated in detail.Finally,the efficiency assessment of two-stage cluster sampling in forest inventory is also discussed. |
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| Keywords: | two-stage cluster sampling error expansion factor efficiency coefficient correlation coefficient within clusters |
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