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For the 2004 NAEP, the calculation of school-level replicate base weights SCH_BWTjs(r), r = 1,..., 62, were calculated as follows:
where
SCH_BWTjs is the school base weight for school s in primary stratum j,
Rjr is the set of schools within the r-th replicate stratum for primary stratum j, and
Ujs is the variance unit (1 or 2) for school s in primary stratum j.
For schools in replicate strata comprising three variance units, two sets of school-level replicate base weights were computed (see replicate variance estimation for details): one for the first replicate r1 and another for the second replicate r2. The two sets of school-level replicate base weights SCH_BWTjs(r1), r1 = 1,..., 62, and SCH_BWTjs(r2), r2 = 1,..., 62, were calculated as described below.