DESIGN: a single sampling study.

设计：单一样本研究。

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Methods a stratified sampling study on the epidemiological feature of fatty liver was conducted among 1992 workers from 4 factories of Ma 'anshan iron and steel general company.

方法采用分层整群抽样方法，抽取马钢公司四个工厂共1992名职工进行脂肪肝的流行病学调查。

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Method:A cluster sampling study on the condition of injuries was conducted among 1059 rural inhabitants in a certain township in Tongjiang County, Sichuan province from Jan 1998~Jan 1999.

方法：采用整群抽样方法，对四川省通江县某乡1059名农村居民一年中伤害发生情况进行调查。

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But Scott Zeger, the head of the department of biostatistics at Johns Hopkins, who performed the statistical analysis in the study, points out that clustered sampling is the rule rather than the exception in public-health studies, and that the patterns of deaths caused by epidemics are also very variable by location.

ECONOMIST: The Iraqi war

The bedrock on which the study is founded is the same as that on which opinion polls are built: random sampling.

ECONOMIST: The Iraqi war