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NAEP Assessment Weighting Procedures → Weighting Procedures and Variance Estimation for the 2004 Assessment → Computation of Full-Sample Weights for the 2004 Assessment

Computation of Full-Sample Weights for the 2004 Assessment

         

Computation of Base Weights

School and Student Nonresponse Adjustments

Weight Trimming Adjustments

 

The final or full-sample student weight is the sampling weight used to derive student estimates of population and subpopulation characteristics for the specified assessment type (operational or bridge), subject (reading or mathematics), and age (9, 13, or 17). 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 subgroup provides an estimate of the total number of students in that subgroup in the population.

The full-sample weight, which is used to produce survey estimates, is distinct from a replicate weight, which is used to estimate the variance of student 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 final student weight for student k from school s in jurisdiction j (FSTUWGTjsk) can be expressed as follows:

FSTUWGT subscript jsk equals STU underscore BWT subscript jsk times SCH underscore NRAF subscript js times STU underscore NRAF subscript jk times SCH underscore TRIM subscript js times STU underscore TRIM subscript jk

where

The student adjustment factor does not include a subscript s to reflect the fact that not every student in school s falls into the same student nonresponse cell or the same training group.


Last updated 26 October 2009 (GF)

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National Center for Education Statistics - http://nces.ed.gov
U.S. Department of Education