概念
分群随机抽样(cluster sample)是将调查母体区分为若干个群体，然后以单纯随机抽样方法选定若干群体作为调查样本，对群体内各子体进行普遍调查。是抽样调查中的一种方法。英文描述
probability sample in which the sampling units are selected in groups to reduce data collection costs.
A simple random sample of clusters is selected.
All items in the selected clusters can be used ,or items can be chosen from a clusters using another probability sampling technique.
