statistical sampling analysis
statistical sampling analysis
统计抽样分析
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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