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NAEP Assessment Sample Design → NAEP 2007 Sample Design → Sample Design for the 2007 National Assessment → 2007 Twelfth-Grade Public School National Sample → School and Student Participation for the 2007 Twelfth-Grade Public School National Assessment

NAEP Technical DocumentationSchool and Student Participation for the 2007 Twelfth-Grade Public School National Assessment

School response rates for the NAEP 2007 twelfth-grade public school sample, both before the inclusion of substitutes and after the inclusion of 16 responding substitutes for eligible original nonrespondents, are shown in Table 1. The weighted response rates use the student enrollment from the frame divided by the school probability of selection.

Table 1. Unweighted and weighted response rate of sample-eligible schools, twelfth-grade public schools, by region: 2007

Region	Sample eligible count	Unweighted school response rate (percent)	Weighted school response rate (percent)
NOTE: Counts of schools are rounded to the nearest ten. Detail may not sum to totals due to rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007.
National	550	91.56	91.56
Northeast	80	96.43	95.85
Midwest	110	92.11	90.94
South	210	91.30	91.89
West	140	88.57	88.56

The student response rates in the writing assessment are found in Table 2. Excluded students were identified in the same way as for the grades 4 and 8 assessments.

Table 2. NAEP twelfth-grade public schools weighted student response and exclusion rates, by region: 2007

Region	Weighted student response rates	Weighted percent of all students who are SD and excluded	Weighted percent of all students who are ELL and excluded
National	79.07	2.84	0.59
Northeast	73.70	2.83	0.50
Midwest	78.39	2.12	0.39
South	83.22	3.53	0.42
West	77.95	2.52	1.13
NOTE: SD = Students with disabilities; ELL = English language learners. Counts of schools are rounded to the nearest ten. Detail may not sum to totals due to rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007.

A nonresponse bias analysis was conducted because the response rate for the twelfth-grade public school sample was below 85 percent.

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