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The NCES Common Core of Data (CCD) public school file from which most of the sampled schools were drawn corresponds to the 1997-98 school year, two years prior to the assessment school year. During the intervening period, some of these schools either closed or no longer offered the grade of interest. In other cases, records in the CCD file were sampled and found to be special schools, such as adult education programs, subsidiary vocational programs, schools for blind and deaf students, and correctional facilities. In such cases, the sampled school was coded as ineligible for the NAEP assessment.
The upper portion of the table on the web page School Participation for the 2001 National Main Assessment provides counts of the schools that were not eligible to participate in the 2001 national main assessment.