NAEP Technical DocumentationTreatment of Items in the Scaling of the 2008 Reading Long-Term Trend Assessment Scales

Items deleted from the final scaling, reading long-term trend assessment, by block and age: 2008
Age	Block	NAEP ID	Reason for decision
Note: A single overall scale was used. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Reading Long-Term Trend Assessment.
13	R26	R024504	Poor item response function (IRF) characteristics
13	R30	R027805	To match 2004 differential item functioning (DIF)
17	R28	R027805	To match 2004 differential item functioning (DIF)

Recoding of polytomous items for scaling, reading long-term trend assessment, by block and age: 2008
Age	Block	NAEP ID	Reason for decision	Disposition
Note: A single overall scale was used. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Reading Long-Term Trend Assessment.
9	R21	R021203	Poor item response function (IRF) fit	Collapse categories 0,1,2,3,4 becomes 0,0,1,2,3
9	R25	R022405	To match 2004 scaling	Collapse categories 0,1,2,3 becomes 0,0,1,1
13	R21	R021203	Poor item response function (IRF) fit	Collapse categories 0,1,2,3,4 becomes 0,1,1,2,3

Last updated 15 December 2011 (GF)