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NAEP Technical DocumentationQuality Control on Weighting Procedures for the 2012 LTT Assessment

			Main QC Findings of Interest Participation, Exclusion, and Accommodation Rates Nonresponse Bias Analysis

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 response, exclusion, and accommodation rates;

• checking demographic data of individual schools;

• comparisons with 2008 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 enrollment by race/ethnicity and urban-centric 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 status in National School Lunch Program (NSLP).

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