sampling units中文什么意思

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Multistage sampling in forest inventory is not restricted to fixed-area sampling units .
森林資源清查中，多階抽樣并不局限于固定面積的抽樣單元。
Primary sampling unit
初步抽樣單位
Retaining sampled units for changed probability and the optimum matching ratio in successive sampling survey
概率發(fā)生變化時(shí)的連續(xù)抽樣及最優(yōu)匹配比
Are measures adopted to ensure samples units under test are uniquely identified and related to the test data
有否采取措施來(lái)確保測(cè)試數(shù)據(jù)是由相關(guān)的樣本得到？
A type of probability sample in which aggregations of sampling units , called clusters , are sampled at some stage in the process
是一種將樣本單元聚集在一起的隨機(jī)抽樣法.樣本群在抽樣的某一步驟被抽出

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