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School Nonresponse Adjustment Factor Calculation for the 2007 Assessment

In each final school nonresponse adjustment cell c, the school nonresponse adjustment factor SCH_NRAFc was computed as follows:

SCH underscore NRAF subscript c equals open paren summation with underscript S subscript c SCH underscore BWT subscript c s times SCH underscore TRIM subscript s times SCHSESWT subscript s times cap x subscript s close paren divided by open paren summation with underscript R subscript c SCH underscore BWT subscript c comma s times SCH underscore TRIM subscript s times SCHSESWT subscript s times cap x subscript s
 

where

  • Sc is the set of all eligible sampled schools (cooperating original and substitute schools, and refusing original schools with noncooperating or no assigned substitute) in cell c,

  • Rc is the set of all cooperating schools within Sc,

  • SCH_BWTcs is the inverse of the school probability of selection,

  • SCH_TRIMs is the school-level weight trimming adjustment factor,

  • SCHSESWTs is the school-level session assignment weight, and

  •  Xs is the estimated grade enrollment corresponding to the original sampled school.


Last updated 07 April 2010 (GF)

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