​NAEP Technical DocumentationSampling Frame for the 2019 Twelfth-Grade Public School National Assessment

			Twelfth-Grade Schools and Enrollment New-School Sampling Frame

The primary sampling frame for the 2019 twelfth-grade public school samples for the mathematics, reading, and science assessments was developed from the Common Core of Data (CCD) file corresponding to the 2016-2017 school year. The CCD file is the Department of Education’s primary database of public elementary and secondary schools in the United States including U.S. territories. It includes all regular public, state-operated public, Bureau of Indian Education (BIE), and Department of Defense Education Activity (DoDEA) schools open during the 2016-2017 school year. This twelfth-grade sampling frame is referred to as the CCD-based sampling frame.

A secondary sampling frame was also created for these samples to account for schools that newly opened or became newly eligible between the 2016-2017 and 2018-2019 school years. This frame contains brand-new and newly-eligible twelfth-grade schools and is referred to as the new-school sampling frame.

Both sampling frames excluded ungraded schools, vocational schools with no enrollment, special education-only schools, prison and hospital schools, home school entities, virtual or online schools, adult and evening schools, and juvenile correctional institutions. Vocational schools with no enrollment serve students who split their time between the vocational school and their home school.

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