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The Common Core of Data (CCD) public school frame from which most of the sampled schools were drawn corresponds to the 2009-2010 school year, some three years prior to the assessment school year. During the intervening period, some of these schools either closed, no longer offered grade 12, or were ineligible for other reasons. In such cases, the sampled schools were considered to be ineligible.
The table below presents unweighted counts of ineligible schools and their eligibility, by status, for the twelfth-grade public school sample.
| Eligibility status | Unweighted count of schools | Unweighted percent |
|---|---|---|
| NOTE: Numbers of schools are rounded to nearest ten, except those pertaining to ineligible schools. Detail may not sum to totals due to rounding. Percentages are based on rounded counts. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 National Assessment. | ||
| Total | 2,030 | 100.00 |
| Eligible | 1,940 | 95.57 |
| Has sampled grade, but no eligible students | 7 | 0.34 |
| Does not have sampled grade | 15 | 0.74 |
| Closed | 22 | 1.08 |
| Not a regular school | 37 | 1.82 |
| Duplicate on sampling frame | 0 | 0.00 |
| Other ineligible | 13 | 0.64 |