NAEP Assessment Sample Design → NAEP 2008 Sample Design → 2008 Long-Term Trend (LTT) Assessment Sample Design → 2008 Private School Long-Term Trend (LTT) Assessment → Ineligible Private Schools for the 2008 Long-Term Trend (LTT) Assessment

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

The Private School Universe Survey (PSS) school file from which most of the sampled schools were drawn corresponds to the 2003-04 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 private schools by age and eligibility status, including the reason for ineligibility.

Number of sampled private schools, long-term trend (LTT) 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 private schools	210	100.00
	Eligible schools	170	80.95
	No eligible students in age range	9	4.29
	School closed	17	8.10
	Not a regular school	7	3.33
	Other ineligible school	2	0.95
	Duplicate on sampling frame	0	0.00
13	All age 13 sampled private schools	190	100.00
	Eligible schools	140	73.68
	No eligible students in age range	23	12.11
	School closed	20	10.53
	Not a regular school	3	1.58
	Other ineligible school	1	0.53
	Duplicate on sampling frame	0	0.00
17	All age 17 sampled private schools	190	100.00
	Eligible schools	150	78.95
	No eligible students in age range	19	10.00
	School closed	14	7.37
	Not a regular school	9	4.74
	Other ineligible school	4	2.11
	Duplicate on sampling frame	0	0.00

The table below presents unweighted counts of sampled private schools by private school type, eligiblity status, and age group.

Number of sampled private schools, long-term trend (LTT) assessment, by age, eligibility status, and private school type: 2008

Private school type	Eligibility status	Age 9		Age 13		Age 17
		Unweighted count of schools	Unweighted percentage	Unweighted count of schools	Unweighted percentage	Unweighted count of schools	Unweighted percentage
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.
All private schools	Total	210	100.00	190	100.00	190	100.00
	Eligible	170	80.95	140	73.68	150	78.95
	Ineligible	35	16.67	47	24.74	46	24.21
Catholic	Total	80	100.00	80	100.00	60	100.00
	Eligible	80	100.00	60	75.00	60	100.00
	Ineligible	6	7.50	14	17.50	1	1.67
Other non-Catholic private	Total	130	100.00	110	100.00	130	100.00
	Eligible	100	76.92	80	72.73	90	69.23
	Ineligible	29	22.31	33	30.00	45	34.62

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