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

NAEP Technical DocumentationIRT parameters for the change and continuity in American democracy: ideas, institutions, practices, and controversies 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	4	H065801	0.37	0.33	†	0.18	0.64	-0.83	†	†
	6	H066001	0.48	1.49	†	0.64	-0.64	†	†	†
	9	H066301	0.81	0.97	0.27	†	†	†	†	†
	10	H066401	1.07	1.55	0.21	†	†	†	†	†
	11	H066501	0.77	0.19	†	2.11	-0.36	-1.74	†	†
	12	H066601	0.90	0.55	0.23	†	†	†	†	†
H4	7	H054701	0.93	1.21	0.19	†	†	†	†	†
	8	H054801	0.54	0.38	†	0.84	-0.84	†	†	†
	14	H055401	0.76	-0.15	0.25	†	†	†	†	†
H5	4	H056001	1.03	1.55	0.19	†	†	†	†	†
	6	H056201	0.58	0.39	0.25	†	†	†	†	†
	7	H056301	1.29	1.35	0.15	†	†	†	†	†
	9	H056501	0.79	1.07	0.31	†	†	†	†	†
H6	7	H067701	0.66	1.04	†	0.75	-0.75	†	†	†
	11	H068101	0.30	1.98	0.30	†	†	†	†	†
H7	6	H097401	0.40	3.27	0.25	†	†	†	†	†
	13	H079201	0.45	1.70	0.21	†	†	†	†	†
	15	H097501	0.22	0.24	0.25	†	†	†	†	†
H8	5	H078801	0.50	1.17	0.20	†	†	†	†	†
	6	H078802	0.87	0.07	0.22	†	†	†	†	†
	7	H097601	0.70	0.51	0.22	†	†	†	†	†
	8	H079001	0.57	1.85	0.17	†	†	†	†	†
	10	H081001	0.39	-0.60	†	-0.00	0.00	†	†	†
	13	H078101	0.56	0.94	†	0.54	-0.54	†	†	†

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