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NAEP Weighting Procedures → 2002 Weighting Procedures and Variance Estimation → State Assessment Weights → Computation of Base Weights

NAEP Technical DocumentationComputation of Base Weights

			Computation of School Base Weights for Originally Sampled Schools Computation of School Base Weights for New Schools Computation of School Base Weights for Substitute Schools Computation of 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 new or substitute school), a new school, or a substitute school.

Computation of a student base weight reflects its overall probability of selection accounting for school and student sampling and its assignment to the reading or writing assessment. 

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