IBM Support

How does SPSS Complex Samples handle singleton clusters within strata?

Question & Answer


I'm using published data from a survey that employed a stratified cluster sampling design. The study designers have provided us with the stratification and clustering variables and the final sample weights, and instructed us to analyze the data as a single-stage design, using with replacement (WR) estimation. For some reason there are some strata that each have only one cluster. How does SPSS Complex Samples handle these strata?


If a stratum has only a single cluster, then there is no within stratum cluster-level variation, and such a stratum will not contribute anything to the variance estimates. For details of the variance computations, see the CS algorithms documents. These are available via Help>Algorithms.

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Modified date:
16 April 2020