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Annual stratum for variance estimation


STRATANN is the annual sampling strata that represents the impact of sample design stratification on the estimates of variance and standard errors. It is appropriate to use STRATANN to generate annual estimates for all years. For pooled analyses including years before 2002 or after 2018, analysts should instead use the pooled variance sampling strata variable, STRATAPLD. For analyses limited to years 2002-2018, STRATANN is suitable for use in annual and pooled analyses.

From 1996-2001 and 2019 forward, STRATANN were statistically independent from year to year. From 2002-2018, strata are constant within sample design period. For analysis, researchers need to use STRATANN in conjunction with PSUANN to account for stratification and clustering when computing variance estimates with MEPS data.


STRATANN is a 4-digit numeric variable.

0000: Not in Universe


There are no comparability issues.


  • 1996-2019: All persons.


  • 1996-2019



This variable has no flags.