NAEP Technical DocumentationParticipation, Exclusion, and Accommodation Rates for Age 17 LTT Reading in 2008

The following table displays the school-level participation rates and student-level participation, exclusion, and accommodation rates for the age 17 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 sample schools only and do not reflect any effect of substitution. The rates weighted by the 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 17 long-term trend reading assessment, by school type: 2008
Domain	Number of schools in original sample	School participation rates (percent) before substitution (weighted by base weight and enrollment)	School participation rates (percent) before substitution (weighted by base weight only)	Number of students sampled	Weighted percent of students excluded	Weighted student participation rates (percent) after makeups	Weighted percent of students accommodated
¹ 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. NOTE: Numbers of schools are rounded to nearest 10, and numbers of students are rounded to nearest 100. 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), 2008 Reading Long-Term Trend Assessment.
National All¹	590	90.28	84.70	12,400	3.52	87.72	7.81
Northeast All	120	93.23	74.19	2,300	2.93	82.63	12.30
Midwest All	130	90.09	89.98	2,800	3.85	91.11	6.65
South All	210	93.25	84.19	4,500	4.31	88.56	7.72
West All	140	83.79	85.88	2,800	2.44	87.09	5.76
National Public	400	92.50	95.01	10,200	3.79	87.55	7.80
National Private	200	60.94	55.66	2,200	0.24	90.45	7.94
Catholic	60	76.41	86.46	1,500	0.20	91.52	3.06
Non-Catholic	130	43.17	49.38	700	0.28	88.66	13.55

Last updated 09 March 2011 (GF)

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