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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 12 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 12 U.S. history national main assessment, by item and block: 2006

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† 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	H073501	0.47	-0.25	†	0.46	-0.46	†
	4	H073801	0.47	0.50	0.20	†	†	†
	8	H074201	0.91	0.10	0.21	†	†	†
	13	H074701	2.69	1.12	0.32	†	†	†
	14	H074801	0.65	1.21	†	-0.82	0.82	†
	15	H074901	1.17	0.67	0.20	†	†	†
H4	2	H045601	0.75	0.00	0.31	†	†	†
	4	H045801	1.74	0.20	0.27	†	†	†
	8	H046201	0.90	0.14	0.22	†	†	†
H5	1	H062001	0.62	-1.28	†	0.74	-0.74	†
	3	H062201	0.59	0.72	†	-0.22	0.22	†
	8	H062701	1.33	0.32	0.21	†	†	†
	12	H063101	0.59	0.63	†	0.66	-0.66	†
	13	H063201	1.14	0.16	0.21	†	†	†
	16	H063501	0.45	-1.33	0.26	†	†	†
	17	H063601	0.54	0.59	†	0.78	-0.78	†
	18	H063701	0.69	1.43	0.23	†	†	†
H6	17	H049901	0.60	0.42	0.24	†	†	†
H7	3	H075501	0.47	-0.14	0.26	†	†	†
	7	H075901	0.73	0.75	0.26	†	†	†
	11	H076301	1.07	2.34	0.25	†	†	†
	12	H076401	0.75	0.33	†	0.28	-0.28	†
	13	H076501	0.70	1.45	†	0.88	-0.88	†
	16	H076801	0.48	-0.65	†	0.45	-0.45	†
H8	9	H052101	0.56	-1.40	0.24	†	†	†
	10	H052102	0.84	-0.05	0.21	†	†	†
	12	H052301	0.33	0.91	†	1.45	0.34	-1.79
H9	5	H060801	0.77	-0.37	0.31	†	†	†
	9	H061201	0.95	1.55	0.29	†	†	†
H10	3	H042101	0.73	-0.19	0.44	†	†	†
	4	H042102	0.84	0.37	0.29	†	†	†
	11	H042701	0.58	-0.85	0.19	†	†	†
	12	H042702	0.80	-1.22	0.21	†	†	†
	16	H043001	0.63	0.19	†	0.52	-0.52	†
	17	H043101	0.28	0.50	†	1.57	-1.57	†
H11	6	H0642CL	0.44	0.00	†	0.57	-0.57	†
	7	H064401	0.64	0.91	†	0.30	0.12	-0.42
	8	H064501	0.88	-1.05	0.27	†	†	†

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