nationwide sampling survey的意思|示意

AIM: to set up statistical methods for calculation of intensity of schistosome infection in residents in nationwide sampling survey of schistosomiasis.

目的：为全国血吸虫病抽样调查居民血吸虫感染度的总体参数建立统计学方法。

Methods Complying with the united plan of medical survey nationwide, we combined sampling survey in various layers with general survey and typical survey.

方法遵照全国医疗照射调查的统一方案，采用分层抽样调查、普查和典型调查相结合。