NAEP Assessment Weighting Procedures → Weighting Procedures for the 2011 Assessment → Quality Control on Weighting Procedures for the 2011 Assessment

NAEP Technical DocumentationQuality Control on Weighting Procedures for the 2011 Assessment

			Main QC 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 demographic data of individual schools;

• comparisons with 2009 demographic data; 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 minority enrollment, median income (based on the school ZIP code area), and urban-centric 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 status in National School Lunch Program (NSLP).

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