Sample Design → NAEP 2010 Sample Design → Selection of Primary Sampling Units (PSUs) for the 2010 Assessment → Final Primary Sampling Unit (PSU) Sample for the 2010 Assessment

NAEP Technical DocumentationFinal Primary Sampling Unit (PSU) Sample for the 2010 Assessment

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 proportional to size (with measure of size equal to estimated number of youths) within each stratum. The selection of the noncertainty PSUs was designed to minimize the overlap with the 2008 arts sample, the 2008 long-term trend sample, and the 2009 science sample.

Also, 29 PSUs were included in the sample of PSUs as certainty PSUs.

Distribution of Sampled primary sampling units (PSUs), by PSU type: 2010

PSU type	Number of sampled PSUs
	SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010.
Total	105
Census region
Northeast	15
Midwest	23
South	42
West	25
Certainty/metropolitan status
Certainty metropolitan	29
Non-certainty metropolitan	54
Non-certainty non-metropolitan	22

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