NAEP Assessment Weighting Procedures → Weighting Procedures for the 2011 Assessment → Computation of Full-Sample Weights for the 2011 Assessment → School and Student Nonresponse Adjustments for the 2011 Assessment → School Nonresponse Weight Adjustment for the 2011 Assessment → Development of Final School Nonresponse Cells for the 2011 Assessment

NAEP Technical Documentation Development of Final School Nonresponse Cells for the 2011 Assessment

Limits were placed on the magnitude of cell sizes and adjustment factors to prevent unstable nonresponse adjustments and unacceptably large nonresponse factors. All initial weighting cells with fewer than six cooperating schools or adjustment factors greater than 3.0 for the full sample weight were collapsed with suitable adjacent cells. Simultaneously, all initial weighting cells for any replicate with fewer than four cooperating schools or adjustment factors greater than the maximum of 3.0 or two times the full sample nonresponse adjustment factor were collapsed with suitable adjacent cells. Initial weighting cells were generally collapsed in reverse order of the cell structure; that is, starting at the bottom of the nesting structure and working up toward the top level of the nesting structure.

Public School Samples for Reading, Mathematics, and Science at Grades 4 and 8

For the public school samples, cells with the most similar race/ethnicity classification within a given jurisdiction/Trial Urban District Assessment (TUDA) district and urbanicity (urban-centric locale) stratum were collapsed first. If further collapsing was required after all levels of race/ethnicity strata were collapsed, cells with the most similar urbanicity strata were combined next. Cells were never permitted to be collapsed across jurisdiction or TUDA district.

Private School Samples for Reading, Mathematics, and Science at Grades 4 and 8

For the private school samples, cells with the most similar race/ethnicity classification within a given affiliation, census division, and urbanicity stratum were collapsed first. If further collapsing was required after all levels of race/ethnicity strata were collapsed, cells with the most similar urbanicity classification were combined. Any further collapsing occurred across census division strata but never across affiliation.

Public School Samples for WCBA at Grades 8 and 12

For the public school samples, cells with similar high percentage Black/Hispanic status within a given census region and urbanicity stratum were collapsed first. If further collapsing was required, cells with the most similar urbanicity strata within a given census region were combined next. No further collapsing occurred after all levels of urbanicity strata were collapsed. That is, collapsing never occurred across census region.

Private School Samples for WCBA at Grades 8 and 12

For the private school samples, if collapsing was necessary, all census region cells within a given affiliation were collapsed. However, collapsing never occurred across affiliation.

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