... multistage cluster sample 多段聚类样本 多段?聚样本 multistage sampling 多段取样法 multistage theories 多阶段理论 ...
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multistage sampling scheme 多级摄影取样图
stratified multistage sampling 分层多级抽样
aerial photo multistage sampling 航空像片多阶抽样法
two-stage and multistage sampling 两阶和多阶抽样
multistage stratified random sampling [统计] 多级分层随机抽样
multistage data sampling 多阶段数据取样
multistage mixed sampling 多级混合抽样
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Methods a questionnaire was conducted among target population by multistage sampling.
方法采取多阶段抽样，对目标人群进行询问式问卷调查。
The coefficient optimization for the multistage sampling rate conversion is also presented.
还给出了多级实现的系数优化算法。
Methods A total of 550 students in 4 junior schools were sampled with multistage sampling and surveyed.
方法通过多级随机抽样抽取济南市4所初中550名初一学生，采用问卷调查。
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