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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Treatment of Items to Avoid Violations of Assumptions → Treatment of Items in NAEP Assessments → Treatment of Items in the Scaling of the 2004 Reading Long-Term Trend Assessment Scales

NAEP Technical DocumentationTreatment of Items in the Scaling of the 2004 Reading Long-Term Trend Assessment Scales

Items deleted from the final scaling, reading long-term trend assessment, by age: 2004

Age	Block	NAEP ID	Reason for decision
13	R26	N024504	Lack of fit
	R30	N027805	Differential item functioning (DIF)
17	R28	N027805	Differential item functioning (DIF)
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004 Reading Long-Term Trend Assessment Scales.

Recoding of polytomous items for scaling, reading long-term trend assessment, age 9: 2004

Age	Block	NAEP ID	Reason for decision	Disposition
9	R25	N022405	Poor fit in scaling	Collapse categories: 0, 1, 2, 3 becomes 0, 0, 1, 1
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004 Reading Long-Term Trend Assessment Scales.

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