This is a 5-digit numeric variable.
This variable is the strata identifier for the sample. Strata is a constructed variable that captures implicit geographic stratification resulting from the sample design. It is created by assigning a unique identifier to groups of between 10 and 19 adjacent households. Additional documentation is available on the Variance Estimation page.
Supported by: National Institutes of Health, National Science Foundation, Stat/Transfer, and University of Minnesota.
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