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NAEP Technical DocumentationParticipation, Exclusion, and Accommodation Rates for Grade 12 Science

The following table displays the school- and student-level response, exclusion, and accommodation rates for the grade 12 science 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 jurisdiction 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, grade 12 science assessment, by school type and geographic region: 2009

School type and geographic region	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 percentage of students excluded	Weighted student participation rates (percent) after makeups	Weighted percentage of students accommodated
1 Includes national public, national private, Bureau of Indian Education, and Department of Defense Education Activity schools located in the United States. NOTE: Numbers of schools are rounded to nearest ten, and numbers of students are rounded to nearest hundred. 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), 2009 Science Assessment.
National all1	2,040	83.25	79.09	15,600	2.54	79.81	6.91
Northeast all	500	85.05	80.37	2,800	2.27	75.55	8.76
Midwest all	540	89.68	87.21	3,400	2.01	80.88	7.46
South all	640	88.85	80.34	5,800	3.31	83.44	6.38
West all	360	67.62	65.33	3,600	2.24	76.84	5.53
National public	1,700	86.39	87.46	14,200	2.75	79.25	7.16
National private	350	52.29	56.87	1,400	0.26	87.68	4.28
Catholic	40	59.62	72.39	500	0.25	87.41	1.92
Non-Catholic private	310	43.73	53.82	900	0.28	88.04	7.02

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