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NAEP Technical Documentation2011 Writing Computer-Based Assessment (WCBA)
The sample design for the NAEP 2011 writing computer-based assessment (WCBA) provided a nationally representative sample of eighth- and twelfth-grade students.
This was accomplished by designing separate sample components for public and private schools. The selected samples were based on a three-stage sample design:
- selection of primary sampling units (PSUs),
- selection of schools within strata, and
- selection of students within schools.
The samples of schools were selected with probability proportional to a measure of size based on the estimated eighth- and twelfth-grade enrollment in the schools.
The target population respectively included all students in public and private schools, Bureau of Indian Education (BIE) schools, and Department of Defense Education Activity (DoDEA) schools in the 50 states and the District of Columbia, who were enrolled in the eighth and twelfth grade at the time of assessment.
The table below shows the target student sample sizes of assessed students for each sample.
| School type | Grade |
Target student sample size |
|---|---|---|
| SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2011 National Writing Computer-Based Assessment. | ||
| Public | 8,12 |
19,800 |
| Private | 8,12 |
2,200 |
To reduce the burden on any particular school, efforts were made to minimize the overlap between the 2011 PSU sample and all other PSU samples selected for NAEP since 2006. The school samples were designed to have minimum overlap with both the United States school sample for the Trends in International Mathematics and Science Study (TIMSS), and the NAEP 2011 state sample.
Last updated 26 February 2016 (GF)