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。
Methods the sampled students, which were taken out from the all middle schools in Sanming city by means of randomized stratification cluster sampling, were investigated with AAT (adaptability test).
方法按整群、分层、随机的原则，采用学习适应性测验(中学生版)对全市中学进行抽样调查。
Hygiene investigation was carried out in 156 classrooms of 36 schools with stratification sampling.
采用分层抽样方法，对36所学校、156间教室进行卫生学调查。
This article summarizes the accuracy and coverage evaluation survey (A. C. E. survey) of the American census 2000. It includes sampling design, post-stratification, dual-system estimation and so on.
本文概要地叙述了美国2000年人口普查后所进行的准确性和数字评估调查（A.C.E。调查）。它包括：抽样设计、事后分层、双系统估计等等。
This article summarizes the accuracy and coverage evaluation survey (A. C. E. survey) of the American census 2000. It includes sampling design, post-stratification, dual-system estimation and so on.
本文概要地叙述了美国2000年人口普查后所进行的准确性和数字评估调查（A.C.E。调查）。它包括：抽样设计、事后分层、双系统估计等等。
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