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Computation of Base Weights


Computation of Base Weights for Originally Sampled Schools

Computation of New-School Base Weights

Computation of Private School Base Weights

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 mathematics or reading assessment. 

Last updated 18 August 2008 (KL)

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National Center for Education Statistics -
U.S. Department of Education