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NAEP Assessment Weighting Procedures → Weighting Procedures for the 2007 Assessment → Quality Control for Weighting Procedures for the 2007 Assessment

NAEP Technical DocumentationQuality Control for Weighting Procedures for the 2007 Assessment

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

Given the complexity of the weighting procedures utilized 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 of the weighting process;

• review of participation, exclusion, and accommodation rates;

• checking of individual schools' demographic data;

• comparisons with 2005 demographic data for public schools by state; and

• 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 group enrollment, median income (based on the school zip code area), and locale. At the student level, the tabulations included race/ethnicity, gender, relative age, students with disability (SD) status, English language learners (ELL) status, and participation in national school lunch program (NSLP) status.

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