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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 Economic and Technological Changes and Their Relation to Society, Ideas, and the Environment Scale, Grade 4 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the economic and technological changes and their relation to society, ideas, and the environment 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	1	H065501	1.04	1.04	0.28	†	†
H4	2	H054201	0.47	-0.62	0.21	†	†
	3	H054301	0.88	-0.90	†	†	†
	4	H054401	0.71	-0.31	0.24	†	†
	5	H054501	1.28	1.18	0.27	†	†
	6	H054601	0.39	1.03	†	1.56	-1.56
	10	H055001	1.52	0.49	0.29	†	†
	11	H055101	1.03	0.86	0.22	†	†
	12	H055201	1.50	0.39	0.35	†	†
	13	H055301	0.61	1.15	†	0.45	-0.45
H5	11	H056701	0.39	-0.18	0.27	†	†
	12	H056801	0.53	-0.22	†	2.08	-2.08
	15	H057101	0.65	0.04	0.26	†	†
H6	4	H067401	0.66	0.61	†	0.87	-0.87
	8	H067801	1.20	0.55	0.21	†	†
	13	H068301	0.58	1.66	†	0.17	-0.17
H7	3	H057401	0.87	1.74	0.24	†	†
	4	H057501	0.63	0.72	†	1.70	-1.70
	12	H058301	0.31	1.91	0.32	†	†
	13	H058401	0.89	-0.04	0.35	†	†
	16	H058701	0.51	0.92	†	0.98	-0.98
H8	4	H034401	0.82	-0.76	†	†	†
	11	H035001	0.97	1.18	†	0.17	-0.17
	12	H035002	1.43	0.70	0.26	†	†
	13	H035101	0.62	0.11	†	0.22	-0.22

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