...stage cluster sampling : 分层一级整群抽样，分层一阶整群抽样 stratified multi-stage cluster sampling : 分层多级整群抽样，分层多阶整群抽样 covariance for cluster sampling : 整群抽样协方差 ..
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Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
方法对社区人群采用多阶段分层整群随机抽样方法抽取研究对象，进行个案调查和血清学检测。
Methods. The survey was conducted according to multi-stage stratified cluster sampling method.
方法：分阶段分层整群随机抽样调查。
RESEARCH METHODThe stratified multi-stage cluster random sampling method was used in the survey.
研究方法本研究采用分层整群随机抽样方法进行抽样。
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