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Computation 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. 


Last updated 18 August 2008 (KL)

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