Methods:A stratified cluster sample of 212 junior middle school students was investigated with a self-made questionnaire.
方法：采用分层整群抽样方法，对武汉市某中学212名初一、二学生进行自编的初中生性知识性态度问卷调查。
Methods: an anonymous questionnaire was completed on a stratified cluster sample of 1735 elementary school and middle school students who were randomly selected from Hegang.
方法：分层随机整群抽取鹤岗市1735名中小学生进行无记名问卷调查。
Methods: Stratified random cluster sampling method was used to determine the survey sample.
方法：以分层随机整群抽样的方法，确定调查样本。
Methods Random sample were obtained from the whole population by multiple stratified cluster and 1 320 objects were surveyed in their own homes by questionnaires.
方法采用多阶段整群抽样和配额抽样相结合的方法，对深圳市1 320名居民进行入户问卷调查。
Methods A cluster stratified sample of 1681 students ham Jianghan University were investigated by SDS.
方法采用分层整群抽样法抽取江汉大学1681名本科学生，采用抑郁自评量表（SDS）进行测评。
During the course of cluster sample verification, systematic sampling and stratified sampling "s accuracy are prior to simple random sampling" s.
群样本检验中，系统抽样群样本检验和分层随机抽样群样本检验的效果优于简单随机抽样群样本检验。
This research adopts investigation methods of stratified sampling and cluster sampling, chooses 95 community health service organizations in 14 cities of Liaoning Province as a analysis sample.
采取分层整群抽样的调查方法，选取辽宁省14个市95家社区卫生服务机构作为分析样本。
Methods: a cluster random stratified sample of 394 medical college students were investigated with a SCL-90 questionnaire.
方法：采取分层整群抽样的方法抽取394名医学生进行SCL- 90症状自评量表的问卷调查。
Methods: a cluster random stratified sample of 394 medical college students were investigated with a SCL-90 questionnaire.
方法：采取分层整群抽样的方法抽取394名医学生进行SCL- 90症状自评量表的问卷调查。
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