Skip Navigation
small NCES header image

Table of Contents  |  Search Technical Documentation  |  References

NAEP Assessment Weighting Procedures → Weighting Procedures for the 2007 Assessment → Computation of Full-Sample Weights for the 2007 Assessment

Computation of Full-Sample Weights for the 2007 Assessment



Computation of Base Weights

School and Student Nonresponse Adjustments

School and Student Weight Trimming Adjustments

The full-sample or final student weight is the sampling weight used to derive NAEP student estimates of population and subpopulation characteristics for a specified grade (4, 8, or 12) and operational subject (mathematics, reading, or writing). The full-sample student weight reflects the number of students that the sampled student represents in the population for purposes of estimation. The summation of the final student weights over a particular student group provides an estimate of the total number of students in that group within the population.

The full-sample weight, which is used to produce survey estimates, is distinct from a replicate weight that is used to estimate variances of survey estimates. The full-sample weight is assigned to participating students and reflects the student base weight after the application of the various weighting adjustments for school and student nonresponse, and school and student trimming. The full-sample weight for student k from school s in stratum j (FSTUWGTjsk) can be expressed as follows:

FSTUWGT subscript j s k equals STU underscore BWT subscript j s k times SCH underscore NRAF subscript j s times STU underscore NRAF subscript j s k times SCH underscore TRIM subscript j s times STU underscore TRIM subscript j s k


School sampling strata for a given assessment varies by school type and grade. See strata for the grades 4 and 8 public school samples; strata for the grade 12 public school sample; and strata for the private school sample at all 3 grades.

Last updated 07 April 2010 (GF)

Printer-friendly Version

Would you like to help us improve our products and website by taking a short survey?

YES, I would like to take the survey


No Thanks

The survey consists of a few short questions and takes less than one minute to complete.
National Center for Education Statistics -
U.S. Department of Education