what`s the difference between cluster sampling and multi-sta
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what`s the difference between cluster sampling and multi-stage sampling?
整群抽样 (Cluster sampling)
整群抽样是将总体中各单位归并成若干个互不交叉、互不重复的集合,称之为群;然后以群为抽样单位抽取样本的一种抽样方式.整群抽样应用整群抽样时,要求各群有较好的代表性,即群内各单位的差异要大,群间差异要小.整群抽样的优点是实施方便、节省经费,特别适用于缺乏总体单位的抽样框.
多阶抽样 (Multi-stage sampling)
多级抽样是指在抽取样本时,分为两个及两个以上的阶段从总体中抽取样本的一种抽样方式.其具体操作过程是:第一阶段,将总体分为若干个一级抽样单位,从中抽选若干个一级抽样单位入样;第二阶段,将入样的每个一级单位分成若干个二级抽样单位,从入样的每个一级单位中各抽选若干个二级抽样单位入样…,依此类推,直到获得最终样本.其优点在于适用于抽样调查的面特别广,没有一个包括所有总体单位的抽样框,或总体范围太大,无法直接抽取样本等情况,可以相对节省调查费用.
整群抽样是将总体中各单位归并成若干个互不交叉、互不重复的集合,称之为群;然后以群为抽样单位抽取样本的一种抽样方式.整群抽样应用整群抽样时,要求各群有较好的代表性,即群内各单位的差异要大,群间差异要小.整群抽样的优点是实施方便、节省经费,特别适用于缺乏总体单位的抽样框.
多阶抽样 (Multi-stage sampling)
多级抽样是指在抽取样本时,分为两个及两个以上的阶段从总体中抽取样本的一种抽样方式.其具体操作过程是:第一阶段,将总体分为若干个一级抽样单位,从中抽选若干个一级抽样单位入样;第二阶段,将入样的每个一级单位分成若干个二级抽样单位,从入样的每个一级单位中各抽选若干个二级抽样单位入样…,依此类推,直到获得最终样本.其优点在于适用于抽样调查的面特别广,没有一个包括所有总体单位的抽样框,或总体范围太大,无法直接抽取样本等情况,可以相对节省调查费用.
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