NAEP Assessment Sample Design → NAEP 2011 Sample Design → Sample Design for the 2011 National Assessment → 2011 Fourth- and Eighth-Grade Private School National Assessment → Sampling of Schools for the 2011 Private School National Assessment

NAEP Technical DocumentationSampling of Schools for the 2011 Private School National Assessment

			Computation of Measures of Size School Sample Sizes: Frame and New School

The private school samples were selected with probability proportional to size using systematic sampling from a sorted list. A school's measure of size was a complex function of the school's estimated grade enrollment. For the eighth grade sample, multiple "hits" were allowed per school, but this was not the case for the fourth grade sample.

Schools were ordered within each school type using a serpentine sort involving the following variables:

• census division,
• urbanicity classification (based on urban-centric locale),
• race/ethnicity status, and
• estimated grade enrollment.

A systematic sample was then drawn with probability proportional to size using this serpentine sorted list and the measures of size.

Schools with unknown affiliation were treated separately. A sample of about 30 schools with unknown affiliation was selected at each of the two grades.

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