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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, by Block and Item, Grade 8 U.S. History National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the change and continuity in American democracy: Ideas, institutions, practices, and controversies scale, by block and item, grade 8 U.S. history national main assessment (accommodations permitted [R3]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
H3	3	H035701	1.12	1.71	0.28	†	†	†	†	†
	4	H035801	0.74	1.90	0.00	-0.13	0.13	†	†	†
	14	H036601	0.66	1.33	0.17	†	†	†	†	†
H4	1	H058801	0.35	2.69	0.21	†	†	†	†	†
	2	H058901	0.97	2.43	0.29	†	†	†	†	†
	3	H059001	0.75	0.68	0.00	0.00	0.00	†	†	†
	5	H059201	0.60	0.32	0.00	0.23	-0.23	†	†	†
	6	H059301	0.80	1.07	0.18	†	†	†	†	†
	15	H060201	0.47	0.47	0.00	-0.05	0.05	†	†	†
H5	1	H037901	0.75	0.83	0.32	†	†	†	†	†
	2	H038001	0.94	-1.58	0.26	†	†	†	†	†
	3	H038101	1.40	1.18	0.40	†	†	†	†	†
	4	H038102	1.78	0.81	0.21	†	†	†	†	†
	5	H038103	0.51	1.89	0.00	-1.09	0.19	0.90	†	†
	6	H038201	1.17	0.69	0.21	†	†	†	†	†
	7	H038202	0.81	0.63	0.28	†	†	†	†	†
	17	H039001	0.76	1.03	0.00	0.03	-0.03	†	†	†
H6	2	H039201	0.62	0.66	0.25	†	†	†	†	†
	5	H039501	0.74	0.51	0.22	†	†	†	†	†
	10	H040001	1.05	0.84	0.00	0.93	-0.93	†	†	†
	15	H040301	1.03	1.63	0.25	†	†	†	†	†
	16	H040401	0.81	-0.82	0.29	†	†	†	†	†
H7	5	H057601	0.70	-0.10	0.21	†	†	†	†	†
	9	H058001	0.56	-0.05	0.24	†	†	†	†	†
	10	H058101	1.27	0.49	0.39	†	†	†	†	†
	11	H058201	0.87	0.31	0.29	†	†	†	†	†
	15	H058601	0.38	-0.71	0.00	0.69	-0.69	†	†	†
H8	7	H034701	0.65	-0.68	0.30	†	†	†	†	†
	8	H034702	0.88	1.54	0.00	0.44	-0.44	†	†	†
	9	H034801	0.86	-0.50	0.28	†	†	†	†	†
	10	H034901	0.47	-2.15	0.25	†	†	†	†	†
	15	H035301	0.37	0.75	0.26	†	†	†	†	†
	16	H035401	0.71	-1.09	0.26	†	†	†	†	†
H9	3	H060601	0.62	0.88	0.20	†	†	†	†	†
	4	H060701	1.01	1.66	0.00	0.26	-0.26	†	†	†
	11	H061401	0.75	-0.51	0.28	†	†	†	†	†
	12	H061501	0.64	1.36	0.00	0.11	-0.11	†	†	†
	16	H061901	0.56	0.88	0.21	†	†	†	†	†
H10	2	H042001	1.14	1.36	0.25	†	†	†	†	†
	8	H042501	0.92	1.64	0.17	†	†	†	†	†
	9	H042601	0.57	-0.08	0.29	†	†	†	†	†
	10	H042602	1.25	2.20	0.09	†	†	†	†	†
	13	H042801	1.23	1.87	0.00	†	†	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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 is the category threshold parameter for category i. The c-parameter value is exactly zero for items scaled with the two-parameter logistic model or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment.

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