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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 Gathering of Interactions of Peoples, Cultures, and Ideas Scale, Grade 4 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the gathering of interactions of peoples, cultures, and ideas scale, grade 4 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	2	H065601	1.50	1.28	0.27	†	†	†
	3	H065701	0.78	1.14	†	2.01	-0.37	-1.64
	5	H065901	0.80	0.91	0.24	†	†	†
	7	H066101	0.81	2.06	0.32	†	†	†
	8	H066201	1.17	0.86	0.27	†	†	†
	13	H066701	0.61	0.96	†	1.52	-1.52	†
	16	H067001	0.67	-0.42	0.31	†	†	†
H4	1	H054101	1.97	1.53	0.23	†	†	†
	9	H054901	0.70	0.57	†	0.42	-0.42	†
H5	1	H055701	1.17	1.08	0.32	†	†	†
	2	H055801	0.92	0.99	0.21	†	†	†
	3	H055901	0.66	0.07	†	0.69	-0.69	†
	5	H056101	0.87	0.95	†	-0.29	0.29	†
	8	H056401	0.55	-0.64	†	0.85	-0.85	†
	10	H056601	0.72	0.19	†	0.96	-0.96	†
	13	H056901	0.64	0.34	0.16	†	†	†
	14	H057001	0.85	0.69	0.31	†	†	†
H6	3	H067301	1.29	1.24	0.23	†	†	†
	5	H067501	0.69	0.52	0.27	†	†	†
	6	H067601	1.45	0.72	0.27	†	†	†
	9	H067901	1.52	1.39	0.30	†	†	†
	10	H068001	0.48	0.80	†	2.54	-1.13	-1.41
	12	H068201	0.65	1.21	†	0.78	-0.78	†
H7	1	H057201	0.55	0.53	0.23	†	†	†
	2	H057301	1.04	0.02	0.24	†	†	†
	6	H057701	0.54	-0.13	†	1.28	-1.28	†
	7	H057801	0.45	2.06	†	0.33	-0.33	†
	8	H057901	0.82	0.53	0.24	†	†	†
H8	2	H034201	1.32	1.71	0.37	†	†	†
	3	H034301	1.12	1.43	0.28	†	†	†
	6	H034601	0.71	0.88	0.26	†	†	†

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