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What is a stratified cluster sample?

April 26, 2017cluster sample stratified

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What is a stratified cluster sample?

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The sample of the Medicare population that is surveyed is stratified by age and drawn within zip code clusters designated as primary sampling units (PSUs). For this reason, survey findings need to use statistical software, such as Stata, Sudaan, Westvar, or SAS, that allow for variance weighting in the statistical procedures to adjust for the non-random sampling procedures.