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NAEP Sample Design → Sample Design for the 2001 Assessment → National Main Assessment Sample Design in 2001 → Sampling of Primary Sampling Units (PSUs) for the 2001 National Main Assessment → Definition of PSU Strata for the 2001 National Main Assessment → Number of Noncertainty Strata in Each Major Stratum in the 2001 National Main Assessment

NAEP Technical DocumentationNumber of Noncertainty Strata in Each Major Stratum in the 2001 National Main Assessment

The following table lists the number of strata for metropolitan statistical area (MSA) and non-MSA PSUs for the 2001 national main assessment by region.

Number of noncertainty strata in each major stratum, national main assessment: By NAEP region, 2001

NAEP region	Total strata	Number of strata for MSA PSUs	Number of strata for non-MSA PSUs
Total	72	36	36
Northeast	10	6	4
Southeast	24	12	12
Central	20	8	12
West	18	10	8
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001.

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