The paper discusses the ratio estimation with systematic PPS sampling and simulates the model with the data of the First Agricultural Census in China on the base of introduction of the ratio estimation with simple ran...The paper discusses the ratio estimation with systematic PPS sampling and simulates the model with the data of the First Agricultural Census in China on the base of introduction of the ratio estimation with simple random sampling. The method of the ratio estimation can solve some problems of precision and multi-purpose survey. Systematic PPS sampling design is a good method to be applied in practice.展开更多
一、系统抽样在运用中存在的问题1、系统抽样用下式计算其估计值:(?)_sy=1/n sum from l=1 n y_(ij)只有在总体单元完全随机的情况下才是无偏的,在此情况下,系统抽样等同于简单随机抽样,否则就难以肯定,如森林分层良好,以及由于长期经...一、系统抽样在运用中存在的问题1、系统抽样用下式计算其估计值:(?)_sy=1/n sum from l=1 n y_(ij)只有在总体单元完全随机的情况下才是无偏的,在此情况下,系统抽样等同于简单随机抽样,否则就难以肯定,如森林分层良好,以及由于长期经营而使森林产生某些规律性变化,都会给系统抽样带来偏倚。2、机械的抽样间隔。展开更多
文摘The paper discusses the ratio estimation with systematic PPS sampling and simulates the model with the data of the First Agricultural Census in China on the base of introduction of the ratio estimation with simple random sampling. The method of the ratio estimation can solve some problems of precision and multi-purpose survey. Systematic PPS sampling design is a good method to be applied in practice.
文摘一、系统抽样在运用中存在的问题1、系统抽样用下式计算其估计值:(?)_sy=1/n sum from l=1 n y_(ij)只有在总体单元完全随机的情况下才是无偏的,在此情况下,系统抽样等同于简单随机抽样,否则就难以肯定,如森林分层良好,以及由于长期经营而使森林产生某些规律性变化,都会给系统抽样带来偏倚。2、机械的抽样间隔。
