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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 4 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 4 U.S. history national main assessment (accommodations permitted [R3]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2
H3	5	H028501	-0.70	-2.28	-0.19	†	†
	Cluster: 6,7	H0286CL	-0.17	-0.73	0.00	†	†
	11	H028901	-0.79	-0.25	-0.23	†	†
	14	H029101	-0.17	-2.78	-0.25	†	†
H4	7	H054701	-0.84	-1.38	-0.21	†	†
	8	H054801	-0.45	-0.51	0.00	0.92	-0.92
	14	H055401	-0.98	-0.08	-0.22	†	†
H5	4	H056001	-0.46	-2.04	-0.20	†	†
	6	H056201	-0.74	-0.51	-0.20	†	†
	7	H056301	-1.50	-1.37	-0.14	†	†
	9	H056501	-0.60	-0.98	-0.22	†	†
H6	7	H032001	-0.34	-1.48	-0.21	†	†
	8	H032002	-0.38	-1.23	-0.26	†	†
	13	H032501	-0.86	-0.96	-0.16	†	†
	14	H032502	-0.65	-0.12	-0.20	†	†
	15	H032503	-0.61	-1.40	0.00	0.07	-0.07
H7	5	H057601	-0.76	-1.40	-0.19	†	†
	9	H058001	-0.68	-0.57	-0.15	†	†
	10	H058101	-0.79	-1.67	-0.37	†	†
	11	H058201	-1.13	-1.43	-0.26	†	†
	15	H058601	-0.40	-0.80	0.00	0.54	-0.54
H8	7	H034701	-0.42	-0.20	-0.22	†	†
	8	H034702	-0.52	-4.63	0.00	1.79	-1.79
	9	H034801	-0.76	-1.00	-0.20	†	†
	10	H034901	-0.61	(-1.266)	-0.21	†	†
	15	H035301	-0.48	-1.38	-0.20	†	†
	16	H035401	-0.66	-0.70	-0.23	†	†
† 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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