NAEP Assessment Weighting Procedures → Weighting Procedures for the 2009 Assessment → Computation of Full-Sample Weights for the 2009 Assessment → School and Student Nonresponse Weight Adjustments for the 2009 Assessment → Student Nonresponse Weight Adjustment for the 2009 Assessment → Development of Final Student Nonresponse Cells for the 2009 Assessment

NAEP Technical DocumentationDevelopment of Final Student Nonresponse Cells for the 2009 Assessment

Similar to the school nonresponse adjustment, cell and adjustment factor size constraints are in place to prevent unstable nonresponse adjustments or unacceptably large adjustment factors. All initial weighting cells with either fewer than 20 participating students or adjustment factors greater than 2.0 for the full sample weight were collapsed with suitable adjacent cells. Simultaneously, all initial weighting cells for any replicate with either fewer than 15 participating students or an adjustment factor greater than the maximum of 2.0 or 1.5 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 towards the top level of the nesting structure. Race/ethnicity cells within SD/ELL, school nonresponse cell, age, and gender classes were collapsed first. If further collapsing was required after collapsing all race/ethnicity classes, cells were next combined across gender, then age, and finally school nonresponse cells. Cells are never collapsed across SD/ELL for any sample.

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