NAEP Technical DocumentationParticipation, Exclusion, and Accommodation Rates for Age 13 LTT Mathematics in 2008

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) mathematics 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 13 long-term trend mathematics assessment, by school type: 2008
School type	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 Mathematics Long-Term Trend Assessment.
National All¹	550	95.37	89.31	9,600	2.86	93.60	9.38
Northeast All	110	93.51	78.95	1,600	2.27	91.77	13.14
Midwest All	140	93.77	93.77	2,200	4.23	94.23	9.01
South All	180	98.26	91.28	3,500	3.50	93.98	9.26
West All	120	93.74	88.66	2,300	1.00	93.70	7.32
National Public	360	96.84	96.96	8,000	3.13	93.44	9.90
National Private	190	79.36	73.36	1,600	0.28	95.39	4.43
Catholic	80	94.16	94.25	1,000	0.45	96.28	3.46
Non-Catholic	110	64.97	63.28	600	0.12	94.01	5.38

Last updated 02 August 2010 (JL)

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