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
Every sampling unit can be certain length , also can be unit of particular area , bulk or cubage , quality or quantum of time 每個(gè)取樣單位可以是一定長(zhǎng)度,也可以是一定面積、體積或容積、質(zhì)量單位或時(shí)間單位等。
Notification letter explaining the purpose of the survey and soliciting cooperation will be mailed to the sampled units beforehand 被選中的單位會(huì)預(yù)先收到郵寄通知書,解釋該統(tǒng)計(jì)調(diào)查的目的以及請(qǐng)求受訪者合作。
Fertilizers - sampling - recommendations for minimum mass of increment of a solid fertilizer to be taken to be representative of the total sampling unit 肥料.第2部分:取樣.第7節(jié):代表全部樣品的固體肥料最小體積增量推薦標(biāo)準(zhǔn)
During the fieldwork period , an enumerator carrying hisher enumerator identity card issued by the planning department will visit the sampled units 在外勤工作期間,訪問員會(huì)帶備由規(guī)劃署發(fā)出的訪問員身分證,到訪被選的單位進(jìn)行訪問。
Notification letter explaining the purpose of the survey and soliciting cooperation will be mailed to the sampled units in private residential buildings beforehand 被選中的私人屋宇單位會(huì)預(yù)先收到郵寄通知書,解釋該統(tǒng)計(jì)調(diào)查的目的以及請(qǐng)求受訪者合作。