NAEP Assessment Sample Design → NAEP 2012 Sample Design → 2012 Long-Term Trend (LTT) Assessment Sample Design → 2012 Public School Long -Term Trend (LTT) Assessment → Sampling Frame of the 2012 Public School Long-Term Trend (LTT) Assessment → Schools and Enrollment in the Public School Frame for the 2012 Public School Long-Term Trend (LTT) Assessment

NAEP Technical DocumentationSchools and Enrollment in the Public School Frame for the 2012 Public School Long-Term Trend (LTT) Assessment

The following table presents the number of schools and estimated enrollment for the public school frame by age population. The unweighted estimated enrollment is restricted to the selected primary sampling units (PSUs). The weighted estimated enrollment incorporates the PSU weight (inverse of the probability of selecting the PSU), and the estimated age-eligible enrollment, and thus is a national estimate of the number of public school students in the age population. The age-eligible enrollment was estimated using age distribution fractions derived for each grade in the age range.

Number of schools and enrollment in public school sampling frame, long-term trend (LTT) assessment, by age: 2012

Age	School count in sampled PSUs	Estimated enrollment (unweighted)	Estimated enrollment (weighted)
NOTE: PSU = primary sampling unit. 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	21,800	1,678,000	3,647,000
13	19,500	1,650,000	3,569,000
17	7,700	1,722,000	3,713,000

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