NAEP Technical DocumentationSampling of Schools for the 2015 Twelfth-Grade Public School National Assessment

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

The sampled schools for the twelfth-grade public school assessment came from two frames: the public school sample frame (as constructed from the Common Core of Data (CCD)) and the new-school sample frame. Schools were sampled from each school frame with probability proportional to size using systematic sampling. Prior to sampling, schools in each frame were sorted by the appropriate implicit stratification variables in a serpentine order. A school's measure of size was a complex function of the school's estimated grade enrollment. Only one hit was allowed for each school.

Schools from the CCD-based frame were sampled at a rate that would yield a national sample of 36,900 assessed students. Schools from the new school frame were sampled at the same rate as those from the CCD-based frame.

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