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NAEP Weighting Procedures → 2003 Weighting Procedures and Variance Estimation → Trimming of Student Weights → Distribution of Student Weight Trimming Factors for Student Groups

Distribution of Student Weight Trimming Factors for Student Groups

The table below shows the distribution of trimming factors of students whose weights were trimmed, by grade, subject, school type, and student group. Student groups that do not appear in the table did not have any students with trimmed weights.

Distribution of student weight trimming factors, by grade, subject, school type and student group, mathematics and reading assessments: 2003
Grade Subject School type Student group Percent of students with trimmed weights Minimum trimming factor Average trimming factor Maximum trimming factor
4 Mathematics Public Arizona 0.17 0.8681 0.8921 0.8967
Colorado 0.25 0.9851 0.9954 0.9983
Florida 0.67 0.8047 0.8419 0.9233
Ohio 0.06 0.9143 0.9143 0.9143
Private Conservative Christian 0.31 0.5704 0.7210 0.8716
Lutheran 0.18 0.8318 0.8318 0.8318
Other private 1.79 0.6037 0.7452 0.9929
Reading Public Arizona 0.10 0.8617 0.8759 0.8901
California 0.01 0.7511 0.7511 0.7511
Florida 0.68 0.8049 0.8364 0.9235
Nevada 0.14 0.9703 0.9836 0.9924
Ohio 0.10 0.9323 0.9323 0.9323
Private Conservative Christian 0.63 0.5704 0.8216 0.9724
Lutheran 0.54 0.7916 0.8197 0.8267
Other private 2.19 0.6090 0.7653 0.9929
8 Mathematics Public Arizona 0.81 0.4203 0.4691 0.4991
Arkansas 1.10 0.6811 0.7299 0.7540
Kansas 0.30 0.8431 0.8922 0.9129
Mississippi 1.95 0.5710 0.7762 0.9574
Nevada 1.07 0.3970 0.4114 0.4582
Tennessee 1.04 0.6756 0.7509 0.7915
Private Other private 3.85 0.4391 0.7444 0.9738
Reading Public Arizona 0.88 0.4448 0.4744 0.4985
Arkansas 1.03 0.6814 0.7313 0.7543
Kansas 0.26 0.7819 0.8792 0.9164
Mississippi 2.08 0.5929 0.7543 0.9505
Nevada 0.83 0.3827 0.4095 0.4240
Tennessee 0.99 0.6743 0.7438 0.8228
Private Conservative Christian 0.19 0.9274 0.9588 0.9902
Other private 3.44 0.4563 0.7289 0.9878
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2003.

Last updated 24 September 2008 (EH)

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