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 → School Nonresponse Weight Adjustments for the 2012 LTT Assessment → Development of Initial School Nonresponse Cells for the 2012 LTT Assessment

NAEP Technical DocumentationDevelopment of Initial School Nonresponse Cells for the 2012 LTT Assessment

The cells for nonresponse adjustments are generally functions of the school sampling strata for the individual samples. For NAEP 2012 LTT, school sampling strata were the same for each age and subject sample, but differed by school type (public or private). Assessment subjects that are administered together by way of spiraling have the same school samples and stratification schemes. Subjects that are not spiraled with any other subjects have their own separate school sample. In NAEP 2012 LTT, the mathematics and reading assessments were spiraled together.

The description of the initial nonresponse cells for the NAEP 2012 LTT samples is given below.

Public School Samples

For public school samples, initial weighting cells were formed within each age sample using the following nesting cell structure:

• census region,

• collapsed urbanicity (collapsed urban-centric locale) stratum, and
• race/ethnicity classification.

Private School Samples

For private school samples, initial weighting cells were formed within each age sample using the following nesting cell structure:

• affiliation (Catholic or non-Catholic),
• census region, and
• collapsed urbanicity (collapsed urban-centric locale) stratum.

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