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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 Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies Scale, Grade 4 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the change and continuity in American democracy: ideas, institutions, practices, and controversies 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	4	H065801	0.35	0.42	†	0.03	0.80	-0.83
	6	H066001	0.47	1.53	†	0.46	-0.46	†
	9	H066301	0.77	0.99	0.23	†	†	†
	10	H066401	0.96	1.56	0.19	†	†	†
	11	H066501	0.84	0.36	†	1.93	-0.28	-1.65
	12	H066601	0.91	0.52	0.21	†	†	†
H4	7	H054701	0.82	1.35	0.20	†	†	†
	8	H054801	0.49	0.52	†	0.86	-0.86	†
	14	H055401	0.89	-0.04	0.21	†	†	†
H5	4	H056001	0.75	1.83	0.21	†	†	†
	6	H056201	0.57	0.46	0.19	†	†	†
	7	H056301	1.55	1.37	0.14	†	†	†
	9	H056501	0.59	1.09	0.25	†	†	†
H6	7	H067701	0.67	0.94	†	0.81	-0.81	†
	11	H068101	0.23	2.02	0.25	†	†	†
H7	5	H057601	0.76	1.44	0.20	†	†	†
	9	H058001	0.67	0.69	0.18	†	†	†
	10	H058101	0.70	1.61	0.34	†	†	†
	11	H058201	0.71	1.45	0.20	†	†	†
	15	H058601	0.39	0.86	†	0.63	-0.63	†
H8	7	H034701	0.37	0.00	0.21	†	†	†
	8	H034702	0.50	4.44	†	1.58	-1.58	†
	9	H034801	0.79	1.15	0.23	†	†	†
	10	H034901	0.58	-1.48	0.20	†	†	†
	15	H035301	0.48	1.72	0.21	†	†	†
	16	H035401	0.59	0.51	0.21	†	†	†

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