NAEP Analysis and Scaling → Estimation of NAEP Score Scales → 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 Assessment, by Item and Block: 2010

NAEP Technical DocumentationIRT parameters for the changing role of America in the world scale, grade 4 U.S. history national assessment, by item and block: 2010

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
† 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), 2010 U.S. History Assessment.
H3	14	H066801	0.49	0.91	0.15	†	†	†	†	†
	15	H066901	0.52	0.11	0.18	†	†	†	†	†
H4	15	H055501	1.26	1.73	0.18	†	†	†	†	†
	16	H055601	1.68	1.97	0.15	†	†	†	†	†
H6	1	H067101	1.19	0.15	0.17	†	†	†	†	†
	2	H067201	1.20	0.33	0.16	†	†	†	†	†
	14	H068401	0.42	-0.73	0.20	†	†	†	†	†
	15	H068501	0.39	1.63	†	-1.35	1.35	†	†	†
	16	H068601	0.77	1.01	0.22	†	†	†	†	†
H7	3	H077401	0.59	1.55	0.16	†	†	†	†	†
	4	H077402	0.43	0.53	†	0.80	-0.80	†	†	†
	5	H097301	0.57	2.46	0.19	†	†	†	†	†
	16	H081401	0.27	-2.02	0.21	†	†	†	†	†
H8	1	H077201	0.39	2.50	0.19	†	†	†	†	†
	3	H078501	0.43	-0.79	0.21	†	†	†	†	†
	4	H080601	0.41	0.87	†	0.61	-0.61	†	†	†
	11	H081201	0.22	0.97	0.21	†	†	†	†	†
	12	H081202	0.37	1.29	0.20	†	†	†	†	†

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