... multi speed control 多速度控制 multi stage sampling 多级抽样法 multi variable control system 多变数控制系 ...
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Multi-stage sampling 多阶段抽样 ; 多阶段取样 ; 多级抽样 ; 多阶段抽样法
two&multi-stage sampling 二阶抽样与多阶段抽样
stratified multi-stage sampling 分层多级抽样 ; 分层多阶段抽样
variance for multi-stage sampling 多阶抽样方差
two-stage or multi-stage sampling 两级或多级抽样
variance estimates for multi-stage sampling 多阶抽样的方差估计值
Large-scale sample surveys are always undertaken with stratified multi-stage sampling.
大型抽样调查总是采用分层多阶段抽样。
We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.
讨论多阶段抽样比率估计及其样本量选择的问题，给出了比率估计抽样均方误差的近似公式及其渐近无偏估计的公式。
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