摘要 本研究以Bootstrap 重复取样程序，评估分层随机取样（stratified random sampling）及规模等比率取样（probability proportional to size），对于调查研究的母体推论影响。
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方法采用分层随机取样法对抽取的15名陆军军人进行结构式访谈。
Methods The 15 soldiers selected through a hierarchical sampling method were treated by an un-structured interview.
在印度旁遮普省昌迪加尔的45所托儿所(anganwadi)中心采用多级分层随机取样法选择了806名6岁以下儿童。
We randomly selected 806 children under 6 years of age from 45 primary anganwadi (childcare) centres in Chandigarh, Punjab, India, that were chosen through multistage stratified random sampling.
采取分层随机取样方式选取大连4所大学在校生作为研讨对象，抽取不同年级、性别的在校生共460名，最后筛选出有效问卷共406份。
The 460 subjects are selected from different grades and gender of four dalian universities by stratified random sampling, and screen out 406 effective questionnaires.
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