a、等距抽样(Systematic sampling) b、分层抽样(Stratified samples) c、整群抽样(Cluster samples) d、简单随机抽样(Simple random sampling) A、概率抽样(Probability samples)： 指在总体中的每个...
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stratified cluster samples 分层整群样本
The diurnal vertical migration of planktonic Ostracoda is studied based on the analysis of stratified samples of zooplanktons in the IONESS system.
根据IONESS系统对浮游动物的分层采样结果，研究浮游介形动物的昼夜垂直移动。
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。
Methods: According to the fifth national demographic investigations, the norm samples aged 10 to 15 years were collected in a stratified and random way.
方法：以年龄10～15岁少年为对象，参考第五次人口抽样调查资料，按分层随机原则取样，根据测验结果和标准化程序建立常模。
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