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NAEP Weighting Procedures → 2002 Weighting Procedures and Variance Estimation → National Main Assessment Weights → School and Student Nonresponse Adjustments → Computation of School Nonresponse Adjustments

NAEP Technical DocumentationComputation of School Nonresponse Adjustments

			Development of School Nonresponse Cells for the Fourth- and Eighth-Grade Public School Samples Development of School Nonresponse Cells for Twelfth-Grade Public School Samples Development of School Nonresponse Cells for Private School Samples

The school response experience in the NAEP 2002 national main assessment was such that response rates varied widely across the subject areas and grades. Adjustments for school nonresponse were made in the weights through weighting cell adjustment.

The starting point for a cell structure was the strata from the school sampling process. When cells based on the strata were too small to allow for stable nonresponse adjustment, cells were collapsed. The final school nonresponse weighting cells are designated as SNRADJ_c^(A), c = 1,...,C^(A), where C^(A) is the total number of weighting cells. The school nonresponse adjustments were computed as follows for each nonresponse weighting cell:

where

• S_c^(A) is the set of all eligible original Session A schools in cell c;

• R_c^(A) is the set of all responding schools within S_c^(A);

• * SCHSES_s^(A) is the Session A school weight;

• TRIM_s is the trimming factor for new and private schools;

• x_s is the school's estimated enrollment; and

• SUBADJ_s is the substitution adjustment factor to account for the difference in size between the substitute and its corresponding original school.¹

¹ Note the value of each TRIM_s and SUBADJ_s is 1 for schools that are not trimmed and are not responding substitutes respectively.

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