NAEP Technical DocumentationIneligible Public Schools for the 2012 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 2008-2009 school year, three years prior to the assessment school year. During the intervening period, some of these schools either closed, no longer served the age group of interest, or became ineligible for other reasons. In such cases, the sampled schools were considered to be ineligible.

The table below presents unweighted counts of sampled public schools by grade and eligibility status, including the reason for ineligibility.

Number of sampled public schools, long-term trend (LTT) assessment, by age and eligibility status: 2012
Age	Eligibility status	Unweighted count of schools	Unweighted percentage
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), 2012 Long-Term Trend Assessment.
9	All age 9 sampled public schools	347	100.00
	Eligible schools	331	95.39
	No eligible students in age range	6	1.73
	School closed	9	2.59
	Not a regular school	0	0.00
	Other ineligible school	1	0.29
	Duplicate on sampling frame	0	0.00
13	All age 13 sampled public schools	375	100.00
	Eligible schools	331	88.27
	No eligible students in age range	23	6.13
	School closed	13	3.47
	Not a regular school	7	1.87
	Other ineligible school	1	0.27
	Duplicate on sampling frame	0	0.00
17	All age 17 sampled public schools	389	100.00
	Eligible schools	367	94.34
	No eligible students in age range	3	0.77
	School closed	7	1.80
	Not a regular school	11	2.83
	Other ineligible school	1	0.26
	Duplicate on sampling frame	0	0.00

Last updated 05 June 2013 (JL)

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