...阶抽样方差 variance estimates for multi-stage sampling : 多阶抽样的方差估计值 stratified cluster samples : 分层整群样本 ..
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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。
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.
方法：以分层随机整群抽样的方法，确定调查样本。
Methods: Stratified random cluster sampling method was used to determine the survey sample.
方法按分层整群抽样的方法抽取样本，并通过问卷调查的方式收集有关广东省18岁以上居民的伤害信息。
Methods the study sample was got by multi-stage randomized sampling, and the injury information of the inhabitants aged over 18 years in Guangdong province was collected by questionnaire.
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