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NAEP Technical DocumentationSampling of Schools for the 2009 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. As with the public school assessment samples, multiple "hits" were allowed per school.

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

• census region,
• 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 three grades.

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