NAEP Technical DocumentationParticipation, Exclusion, and Accommodation Rates for Age 13 Reading for the 2012 LTT Assessment

The following table displays the school-level participation rates and student-level participation, exclusion, and accommodation rates for the age 13 long-term trend (LTT) reading assessment. Various weights were used in the calculation of the rates, as indicated in the column headings of the table.

The participation rates reflect the participation of the original sampled schools only and do not reflect any effect of substitution. The rates weighted by the school base weight and enrollment show the approximate proportion of the student population in the domain that is represented by the responding schools in the sample. The rates weighted by just the base weight show the proportion of the school population that is represented by the responding schools in the sample. These rates differ because schools differ in size.

Participation, exclusion, and accommodation rates for age 13 long-term trend reading assessment, by geographic region and school type: 2012
Geographic region and school type	Number of schools in original sample	School participation rates (percent) before substitution (weighted by school base weight and enrollment)	School participation rates (percent) before substitution (weighted by school base weight only)	Number of students sampled	Weighted percent of students excluded	Weighted student participation rates (percent) after makeups	Weighted percent of students accommodated
NOTE: National all includes national public, national private, Bureau of Indian Education (BIE), and Department of Defense Domestic Dependent Elementary and Secondary Schools (DDESS) that are located in the United States. 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 Reading Long-Term Trend Assessment.
National all	505	87.87	80.75	10,000	1.89	93.19	10.14
Northeast all	85	94.87	66.98	1,600	1.60	92.23	14.57
Midwest all	106	90.38	91.73	1,900	1.43	94.97	11.48
South all	189	87.69	78.36	4,200	2.42	92.45	8.84
West all	125	81.27	80.68	2,400	1.74	93.21	7.71
National public	375	89.94	89.99	9,000	2.03	93.13	10.69
National private	130	68.63	62.72	986	0.38	93.94	4.16
Catholic	37	91.61	91.70	484	0.21	96.42	2.01
Non-Catholic	93	49.13	50.95	502	0.53	91.05	6.16

Last updated 19 April 2013 (JL)

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