Table of Contents  |  Search Technical Documentation  |  References

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

NAEP Technical DocumentationComputation of Base Weights for the 2004 Assessment

			School Base Weights Student Base Weights

Every sampled school and student received a base weight equal to the reciprocal of its probability of selection. Computation of a school base weight varies by whether the school was an originally selected school (i.e., not a substitute school), or a substitute school.

Computation of a student base weight reflects

• the student's overall probability of selection accounting for school and student sampling,
• the school and student assessment type assignment (operational or bridge assessment), and
• the student's assignment to the mathematics or reading assessment. 

Printer-friendly Version