NAEP Technical DocumentationIneligible Public Schools for the 2008 Long-Term Trend (LTT) Assessment

The Common Core of Data (CCD) public school file from which most of the sampled schools were drawn corresponds to the 2004-05 school year, 3 years prior to the assessment school year. During the intervening period, some of these schools either closed or were ineligible for other reasons. In some cases, the sampled schools were ineligible because they had no students within the necessary age range.

The table below presents unweighted counts of sampled public schools by age and eligibility status.

Number of sampled public schools, long-term trend assessment, by eligibility status and age: 2008
Age	Eligibility status	Unweighted count of schools	Unweighted percent
NOTE: Total and eligible school counts are rounded to nearest ten. Percentages are rounded. Detail may not add up to totals due to rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Long-Term Trend Assessment.
9	All age 9 sampled public schools	320	100.00
	Eligible schools	300	93.75
	No eligible students in age range	10	3.13
	School closed	5	1.56
	Not a regular school	2	0.63
	Other ineligible school	0	0.00
	Duplicate on sampling frame	0	0.00
13	All age 13 sampled public schools	360	100.00
	Eligible schools	310	86.11
	No eligible students in age range	30	8.33
	School closed	10	2.78
	Not a regular school	4	1.11
	Other ineligible school	0	0.00
	Duplicate on sampling frame	0	0.00
17	All age 17 sampled public schools	400	100.00
	Eligible schools	360	90.00
	No eligible students in age range	6	1.50
	School closed	8	2.00
	Not a regular school	17	4.25
	Other ineligible school	0	0.00
	Duplicate on sampling frame	0	0.00

Last updated 12 January 2011 (JL)

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