Table of Contents  |  Search Technical Documentation  |  References

NAEP Weighting Procedures → Weighting Procedures for the 2000 State Assessment → Calculation and Use of Replicate Weights → School-Level Replicate Weights

NAEP Technical DocumentationSchool-Level Replicate Weights

Each replicate sample had to be reweighted to compensate for the dropped unit(s) defining the replicate. This reweighting was done in two stages. At the first-stage, the i^th school included in a particular replicate r was assigned a replicate-specific school base weight defined as:

where is the full-sample base weight for school i, and where

For students with a disability and limited-English-proficient students in American Samoa, Guam, Virgin Islands, and the Department of Domestic Dependent Elementary and Secondary Schools grade 8:

Using the replicate-specific school base weights, the school-level nonresponse weighting adjustments were recalculated for each replicate r. That is, the school-level nonresponse adjustment factor for schools in replicate r and adjustment class k was computed as:

where

C_k = the eligible sampled schools in adjustment class k,

= the replicate-r base weight of the i^th school in class k, and

E_ki = the grade enrollment for the i^th school in class k.

In the above formulation, the indicator variable had a nonzero value only when the i^th school in replicate r and adjustment class k participated in the assessment. The replicate-specific nonresponse-adjusted school weight for the i^th school in replicate r in class k was then computed as:

Printer-friendly Version