​​​NAEP Technical DocumentationSampling Frame for the 2022 Eighth-Grade Public School National Assessment in Civics and U.S. History

			Eighth-Grade Schools and Enrollment New-School Sampling Frame

The primary sampling frame for the 2022 eighth-grade public school samples for the civics and U.S. history assessments was developed from the Common Core of Data (CCD) file corresponding to the 2019–2020 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 2019–2020 school year. This eighth-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 2019–​2020 and 2021–2022 school years. This frame contains brand-new and newly-eligible eighth-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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