Many schools were found to be ineligible because they had no students within the necessary age range. The table below presents counts of ineligible schools by status for the three school-age samples.
|Ineligibility/eligibility status||Age nine sample schools: number||Age nine sample schools: percent||Age thirteen sample schools: number||Age thirteen sample schools: percent||Age seventeen sample schools: number||Age seventeen sample schools: percent|
|Total sampled schools||730||100.0||700||100.0||620||100.0|
|Total ineligible schools||50||7.3||100||14.7||60||9.5|
|No students in age range||30||3.6||70||9.6||30||4.3|
|Not regular schools||10||1.0||20||2.7||20||3.2|
|Duplicate on sampling frame||#||0.1||0||0.0||0||0.0|
|# Rounds to zero.
NOTE: Sample sizes are rounded to nearest ten. Percentage calculated using unrounded numbers. 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), 2004.