NAEP Assessment Weighting Procedures → Weighting Procedures for the 2008 Assessment → Weighting Procedures for the 2008 LTT Assessment → Computation of Full-Sample Weights for the 2008 LTT Assessment → School and Student Nonresponse Adjustments for the 2008 LTT Assessment → Student Nonresponse Adjustment for the 2008 LTT Assessment → Development of Final Student Nonresponse Cells for the 2008 LTT Assessment

NAEP Technical DocumentationDevelopment of Final Student Nonresponse Cells for the 2008 LTT 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, due to student nonresponse. All initial weighting cells with either less than 20 participating students or adjustment factors greater than 2.0 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 toward the top level of the nesting structure. For public schools, race/ethnicity cells within SD/ELL status, school nonresponse cell, grade, and gender classes were collapsed first. If further collapsing was required, cells were next combined across gender, then grade, and finally school nonresponse cells. (In NAEP assessments, cells for public schools are never collapsed across SD/ELL status.) Likewise for private schools, race/ethnicity cells within school nonresponse cell, grade, and gender classes were collapsed first. If further collapsing was required, cells were next combined across gender, then grade, and finally school nonresponse cells.

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