NAEP Technical DocumentationSchool and Student Participation in the 2005 National Twelfth-Grade Assessment

School response rates for the 2005 national main twelfth-grade public school sample, both before the inclusion of substitutes and after the inclusion of about 30 responding substitutes for eligible original nonrespondents, are shown in the table below, as are sample counts, summation of the base weights (the reciprocals of the probabilities of selection), and summation of weighted estimates of enrollment. The summation of the base weights represents an estimate of the distribution of responding and nonresponding schools in the population if all schools were canvassed, and the summation of weighted enrollment represents an estimate of the total number of grade-eligible students in responding and nonresponding schools, if all schools were canvassed.

Distribution of nonresponding and and responding sampled twelfth-grade public schools, national main assessment, by school response status: 2005
School response status	Before substitution			After substitution
School response status	School count	Unweighted percent	Enrollment-weighted percent	School count	Unweighted percent	Enrollment-weighted percent
All eligible sampled schools	750	100.00	100.00	750	100.00	100.00
Not responding	110	14.36	14.66	80	10.07	10.08
Responding	640	85.64	85.34	670	89.93	89.92
NOTE: Numbers in table have been rounded. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005.

The student response experience of sampled students in the operational session and science bridge is provided below. Excluded students were identified similarly for the grade 4 and 8 assessments. Because the weighted participation rates for the student sample is below the 85 percent standard established by NCES, a nonresponse bias analysis was conducted for the twelfth-grade public school assessment.

Twelfth-grade public schools weighted student response and exclusion rates, national main assessment, by assessment and region: 2005
Assessment and Region	Weighted student response rates¹	Weighted percent of all students who are SD and excluded²	Weighted percent of all students who are ELL and excluded²
Reading
National	66.38	3.79	0.65
Northeast	62.43	4.05	0.52
Midwest	66.75	3.55	0.23
South	71.19	4.46	0.56
West	61.08	2.81	1.28
Mathematics
National	66.72	3.16	0.54
Northeast	60.93	2.35	0.50
Midwest	67.77	3.06	0.27
South	72.14	3.90	0.34
West	61.34	2.82	1.15
Science
National	67.07	2.85	0.55
Northeast	61.93	2.29	0.43
Midwest	69.10	2.48	0.30
South	71.51	3.94	0.35
West	61.80	2.10	1.19
Science Bridge
National	66.69	2.86	0.47
Northeast	63.49	2.56	0.32
Midwest	66.98	3.03	0.44
South	71.69	3.24	0.36
West	60.68	2.42	0.78
¹ Denominator is the total eligible sample less excluded cases. ² Denominator is the total eligible sample. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005.

Last updated 30 July 2009 (EH)

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