NAEP Assessment Sample Design → NAEP 2011 Sample Design → Sample Design for the 2011 National Assessment → 2011 Writing Computer-Based Assessment (WCBA) → Public School 2011 Writing Computer-Based Assessment (WCBA) → Sampling of Public Schools for the 2011 Writing Computer-Based Assessment (WCBA)

NAEP Technical DocumentationSampling of Public Schools for the 2011 Writing Computer-Based Assessment (WCBA)

			Computation of Measures of Size for the 2011 Public School Writing Computer-Based Assessment School Sample Sizes for 2011 Public School WCBA: Frame and New School

The writing computer-based assessment (WCBA) public school sample was 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.

Schools were ordered within each grade, using the serpentine sort described under the stratification of public schools. A systematic sample was then drawn using this serpentine-sorted list and the measures of size. 

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