抽样是研究和数据收集中不可或缺的方法，能够从更大数据中获得有意义的见解并做出明智的决定的子集。不同的研究领域采用了不同的抽样技术，每种技术都有其独特的优点和局限性。本文将深入探讨了最常见的抽样技术，包括随机抽样、分层抽样、系统抽样 ...

The CLUSTER statement names variables that identify the clusters in a clustered sample design. The combinations of categories of CLUSTER variables define the clusters in the sample. If there is a ...

Suppose that the previous student sample is actually drawn from a stratified sampling. The strata are grades in the junior high school: the 7th grade, the 8th grade, and the 9th grade. Within strata, ...