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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

NAEP Technical DocumentationPrimary Sampling Units (PSUs) for the 2001 National Main Assessment

			Primary Sampling Unit Definition and Frame Creation Definition of PSU Strata Selection of Primary Sampling Units

The samples for the 2001 national main assessment were selected using a complex multistage sample design involving the sampling of students from selected schools within 94 selected geographic areas, called primary sampling units (PSUs), across the United States. The samples were designed to represent fourth-, eighth-, and twelfth-grade students enrolled in public and nonpublic elementary and secondary schools.

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