NAEP Assessment Weighting Procedures → Weighting Procedures for the 2012 Assessment → Weighting Procedures for the 2012 Long-Term Trend (LTT) Assessment → Computation of Full-Sample Weights for the 2012 LTT Assessment → School and Student Nonresponse Weight Adjustments for the 2012 LTT Assessment → Student Nonresponse Adjustment for the 2012 LTT Assessment

NAEP Technical DocumentationStudent Nonresponse Adjustment for the 2012 LTT Assessment

			Development of Initial Student Nonresponse Cells Development of Final Student Nonresponse Cells Student Nonresponse Adjustment Factor Calculation

The student nonresponse adjustment procedure inflates the weights of assessed students to account for eligible sampled students who did not participate in the assessment. These inflation factors offset the loss of data associated with absent students. The adjustments are computed within nonresponse cells and are based on the assumption that the assessed and absent students within the same cell are more similar to one another than to students from different cells. Like its counterpart at the school level, the student nonresponse adjustment is intended to reduce the mean square error and thus improve the accuracy of NAEP assessment estimates.

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