NAEP Technical DocumentationParticipation, Exclusion, and Accommodation Rates for Age 9 Mathematics 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 9 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 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 9 long-term trend mathematics 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 Mathematics Long-Term Trend Assessment.
National all	484	86.64	81.54	9,900	1.47	94.83	10.83
Northeast all	83	93.39	77.87	1,500	1.76	94.96	14.23
Midwest all	100	90.82	86.94	1,900	2.34	95.21	11.12
South all	186	84.18	76.81	4,100	1.18	94.34	10.71
West all	115	82.22	84.85	2,400	0.93	95.15	8.52
National public	347	89.03	89.93	8,900	1.57	94.98	11.51
National private	137	61.16	58.60	944	0.23	92.95	2.89
Catholic	32	95.06	92.80	401	0.00	94.32	2.20
Non-Catholic	105	37.71	44.77	543	0.39	91.50	3.39

Last updated 19 April 2013 (JL)

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