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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

NAEP Technical DocumentationDistribution 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.

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