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NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Changing Role of America in the World Scale, Grade 4 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the changing role of America in the world scale, grade 4 U.S. history national main assessment, by item and block: 2006

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models. NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2006 U.S. History Assessment.
H3	14	H066801	0.62	1.01	0.18	†	†
	15	H066901	0.66	0.27	0.19	†	†
H4	15	H055501	0.88	2.19	0.16	†	†
	16	H055601	1.31	2.42	0.15	†	†
H6	1	H067101	1.25	0.30	0.16	†	†
	2	H067201	1.29	0.51	0.14	†	†
	14	H068401	0.49	-0.21	0.20	†	†
	15	H068501	0.58	1.61	†	-0.74	0.74
	16	H068601	0.91	1.02	0.22	†	†
H7	14	H058501	0.38	3.03	0.28	†	†
H8	1	H034101	0.67	0.66	†	2.52	-2.52
	5	H034501	0.55	3.24	†	†	†
	14	H035201	0.55	2.39	0.20	†	†
	17	H035501	0.69	1.24	0.18	†	†

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