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NAEP Assessment Sample Design → NAEP 2006 Sample Design → Selection of Primary Sampling Units (PSUs) for the 2006 Assessment → Final Primary Sampling Unit (PSU) Sample

NAEP Technical DocumentationFinal Primary Sampling Unit (PSU) Sample

A primary sampling unit (PSU) sample was drawn independently from each of the 76 noncertainty strata defined in Final Primary Sampling Unit Strata. One PSU was selected with probability proportionate to size (with size equal to number of youths) within each stratum. Also, 29 PSUs were included in the sample of PSUs with certainty.

Distribution of sampled PSUs by primary sampling unit (PSU) type: 2006

PSU type	Number of sampled PSUs
Total	105
Metropolitan status
Metropolitan	83
Non-metropolitan	22
Census region
Northeast	15
Midwest	23
South	42
West	25
Certainty/metropolitan status
Certainty metropolitan	29
Noncertainty metropolitan	54
Noncertainty non-metropolitan	22
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2006 .

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