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NAEP Technical DocumentationQuality Control for Weighting Procedures for the 2008 LTT Assessment

			Main Quality Control Findings of Interest Participation, Exclusion, and Accommodation Rates Nonresponse Bias Analyses

Given the complexity of the weighting procedures used in NAEP, a range of quality control (QC) checks was conducted throughout the weighting process to identify potential problems with collected student-level demographic data or with specific weighting procedures. The QC processes included

• checks performed within each step of the weighting process;

• checks performed across adjacent steps in the weighting process;

• review of participation and exclusion rates;

• checks performed on individual schools' demographic data; and

• review of nonresponse bias analyses.

To validate the weighting process, extensive tabulations of various school and student characteristics at different stages of the process were conducted. The school-level characteristics included in the tabulations were racial/ethnic enrollment, median income (based on the school ZIP code area), and locale. At the student level, the tabulations included race/ethnicity, gender, categorized grade, students with disability (SD) status, English language learners (ELL) status, and participation in National School Lunch Program (NSLP) status.

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