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Student Nonresponse Adjustment Factor Calculation for the 2005 Assessment

In each final student nonresponse adjustment cell d for a given sample, the student nonresponse adjustment factor STU_NRAFjk(d) was computed for each student k in jurisdiction j as follows:

STU underscore NRAF subscript jk open paren d close paren equals summation with underscript open paren S subscript j open paren d close paren close paren open paren STU underscore BWT subscript jk times SCH underscore TRIM subscript js times SCH underscore NRAF subscript js divided by SUBJFAC subscript j close paren divided by summation with underscript open paren R subscript j open paren d close paren close paren open paren STU underscore BWT subscript jk times SCH underscore TRIM subscript js times SCH underscore NRAF subscript js divided by SUBJFAC subscript j close paren

where

The adjustment factor does not include a subscript s to reflect the fact that not every student in school s falls into the same student nonresponse cell.

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 13 November 2008 (LH)

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National Center for Education Statistics - http://nces.ed.gov
U.S. Department of Education