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School Nonresponse Adjustments

Preliminary school nonresponse cells were generated for the geography and U.S. history school samples based on the following criteria:

  • Private schools in certainty PSUs were assigned into cells using NAEP region, sample type (R2 or R3), and school type (Catholic, religious non-Catholic, or nonreligious).

  • Private schools in noncertainty PSUs were assigned into cells using metropolitan PSU status, sample type (R2 or R3), and school type (Catholic, religious non-Catholic, or nonreligious).

  • Public schools in certainty PSUs were assigned into cells using NAEP region, sample type (R2 or R3), and high minority or not.

  • Public schools in noncertainty PSUs were assigned into cells using noncertainty PSU stratum pair, sample type (R2 or R3), and high minority or not.

Cells with sample sizes too small (<6) or adjustments too large (>3) were collapsed with other cells to generate the final set of nonresponse cells. The nonresponse adjustments SNk within each final nonresponse cell were equal to the summation of πi–1 × SUBADJi × FTADJi × TRIMi over all eligible sampled schools in the cell (in the original sample), divided by the summation of πi–1 × SUBADJi × FTADJi × TRIMi over all cooperating original and cooperating substitute schools in the cell.

This table summarizes the distribution of nonresponse adjustment SNk for the three grades.

Distribution of the nonresponse adjustments over the sampled cooperating schools, by statistic and grade, national main assessments: 2001
Statistic Grade 4 Grade 8 Grade 12
n 365 369 374
Minimum 1.000 1.012 1.000
25th percentile 1.000 1.019 1.151
Median 1.182 1.122 1.332
75th percentile 1.211 1.166 1.358
Maximum 1.630 1.401 1.692
Mean 1.132 1.137 1.260
Standard deviation 0.140 0.123 0.143
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001.

Last updated 17 June 2008 (MH)

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