two stage sampling

  • 释义

    二次抽样

数据更新时间:2026-04-19 14:05:29
1、

The control sample is drawn out of all controls with two-stage cluster sampling.

采取二阶段整群抽样从对照组抽取样本。

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2、

Methods Grade one students in junior middle schools were selected, a two-stage, stratified cluster sampling method was applied to collect traditional teaching group ( 124), in-class peer group ( 145) and high-grade peer group ( 133).

方法以初一学生为教育对象,采用二阶段分层整群抽样方法,确定传统教学组、本班同伴组和学长同伴组,各组学生人数分别为124145和133人。

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3、

Methods Different high risk sites and the samples were selected by two-stage cluster sampling. All the samples were screened by HIV antibody test and RPR.

方法采用双阶段整群抽样方法抽取场所和样本,使用调查问卷面对面调查,采血检测HIV抗体和梅毒抗体。

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4、

This study adopted two-stage random sampling method. The valid subjects were 300.

本研究采二阶段随机抽样方法, 有效样本共300位.

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