stratified sampling method [统计] 分层抽样法
method of stratified sampling [矿业] 分层取样法 ; 分层抽样法
area stratified sampling 区域分层抽样
disproportionate stratified sampling [统计] 不等比例分层抽样 ; 非比率分层抽样法
covariance for stratified sampling [统计] 分层抽样协方差
proportionate stratified sampling 比率分层抽样法
stratified sampling of water 分层取水样
Stratified sampling [统计] 分层抽样 ; 统计处理
Stratified sampling with optimum allocation 最优配置法
gains from proportionate stratified sampling [统计] 按比例分层抽样的得益
Methods: The stratified sampling and cluster random sampling methods are used in this survey.
方法：本研究采用分层随机抽样方法和整群随机抽样方法。
The survey was completed on the basis of combining stratified sampling and random sampling, collecting 1005 valid samples in total.
调查在分层逐级抽样法与随机抽样法相结合的抽样基础完成，共收集有效样本1005个。
Stratification is one of the key techniques in stratified sampling investigation and monitoring using remotely sensed data.
分层技术是遥感分层抽样调查与监测方法中的关键技术之一。
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