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NAEP Weighting Procedures → Weighting Procedures and Variance Estimation for the 2001 National Main Assessment

Weighting Procedures and Variance Estimation for the 2001 National Main Assessment


Computation of School Weights

School Trimming

School Nonresponse Adjustments

Computation of Student Base Weights

Computation of Student Nonresponse Adjustments

Trimming the Nonresponse Adjusted Student Weights

Computation of Poststratification Adjustments

Replicate Weights and Variance Estimation

The procedures for generating full sample weights and replicate weights for the student samples for the geography and U.S. history assessments include:

  • base weights reflecting school and student sampling,

  • base weight factors reflecting assignment to field sessions and assignment to U.S. history or geography sessions,

  • nonresponse adjustments for school and student nonresponse,

  • trimming adjustments to reduce variability in the sample weights, which reduces mean square error,

  • poststratification adjustments to the Census Bureau's Current Population Survey (CPS) control totals (also to reduce mean square error), and

  • replicate weights for the computation of jackknife variance estimates.

The sample design that determines the base weights is discussed in Sample Design for the 2001 Assessment.

Last updated 13 August 2008 (KL)

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