stratified multistage cluster sampling 分层多级整群抽样 stratified multistage sampling 分层多级抽样 ..
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Methods: By using questionnaires with multistage stratified random cluster sampling method, 726 valid questionnaires of 800 were backed from the university students in 4 universities in Dalian city.
对象与方法：研究对象采取分层整群随机抽样的方法，在大连市4所高校大一、大四年级学生中发放问卷800份，收回有效问卷726份。
Multistage stratified cluster sampling method was used for the sampling.
采用多阶段整群分层抽样方法。
Methods Cluster, stratified and multistage sampling was taken. 1261 residents over 40 years old were assigned to fill in the questionnaires designed by WHO.
方法采用多阶段随机分层抽样方法，对1261名40岁以上居民进行问卷调查。
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