分群隨機抽樣

分群隨機抽樣(cluster sample)是將調查母體區分為若干個群體，然後以單純隨機抽樣方法選定若干群體作為調查樣本，對群體內各子體進行普遍調查。是抽樣調查中的一種方法。

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.