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Student Nonresponse Adjustment Factor Calculation for the 2006 Assessment

In each final student nonresponse adjustment cell c for a given sample, the student nonresponse adjustment factor STU_NRAFc was computed as follows:

STU underscore NRAF subscript c equals summation with underscript S subscript c STU underscore BWT subscript k times SCH underscore TRIM subscript k times SCH NRAF subscript k backslash SUBJFAC subscript k over summation with underscript R subscript c STU underscore BWT subscript k times SCH underscore TRIM subscript k times SCH underscore NRAF subscript k backslash SUBJFAC subscript k

where

The student weight used in the calculation above is the adjusted student base weight, without regard to subject, adjusted for school weight trimming and school nonresponse.

Nonresponse adjustment procedures are not applied to excluded students because they are not required to complete an assessment. In effect, excluded students were placed in a separate nonresponse cell by themselves, considered respondents, and all received an adjustment factor of 1. While excluded students are not included in the analysis of the NAEP scores, weights are provided for excluded students in order to estimate the size of this group and its population characteristics.


Last updated 08 April 2010 (GF)

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National Center for Education Statistics - http://nces.ed.gov
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