Some of the schools in the private school samples and the twelfth-grade public school sample were found to be ineligible (e.g., closed, not a regular school,1 no longer offering grade). The table below presents counts of ineligible schools by status for the twelfth-grade public school sample and the three private school samples.
|Eligibility status||Twelfth-grade public schools||Fourth-grade private schools||Eighth-grade private schools||Twelfth-grade private schools|
|Number of schools||Percent of sample||Number of schools||Percent of sample||Number of schools||Percent of sample||Number of schools||Percent of sample|
|Did not have grade||14||1.1||18||1.1||20||1.2||21||2.3|
|Not regular schools1||66||5.3||21||1.3||37||2.3||32||3.6|
|No eligible students in sampled grade||3||0.2||10||0.6||14||0.9||15||1.7|
|Duplicate on sampling frame||0||0||1||0.1||0||0||0||0|
|1 Educational facilities which are not "regular schools" include special education schools for severely disabled students, adult education centers, annexes, and other such facilities. These are generally screened out of the frame when that is possible to do definitively: otherwise they are sampled and then identified in the field as not regular.
NOTE: Detail may not sum to totals because of rounding.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002.