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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 Economic and Technological Changes and Their Relation to Society, Ideas, and the Environment Scale, by Block and Item, Grade 4 U.S. History National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the economic and technological changes and their relation to society, ideas, and the environment 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	dj3	dj4	dj5
H3	8	H028701	0.59	-0.29	0.00	1.30	-1.30	†	†	†
	9	H028702	1.06	-0.75	0.00	†	†	†	†	†
	10	H028801	0.53	1.82	0.00	0.69	-0.69	†	†	†
	15	H029201	1.82	0.81	0.36	†	†	†	†	†
H4	2	H054201	0.50	-0.42	0.25	†	†	†	†	†
	3	H054301	0.90	-0.86	0.00	†	†	†	†	†
	4	H054401	0.74	-0.21	0.26	†	†	†	†	†
	5	H054501	1.44	1.13	0.29	†	†	†	†	†
	6	H054601	0.41	0.94	0.00	1.40	-1.40	†	†	†
	10	H055001	1.54	0.47	0.30	†	†	†	†	†
	11	H055101	1.07	0.90	0.23	†	†	†	†	†
	12	H055201	1.75	0.29	0.40	†	†	†	†	†
	13	H055301	0.64	1.04	0.00	0.37	-0.37	†	†	†
H5	11	H056701	0.45	0.17	0.32	†	†	†	†	†
	12	H056801	0.56	-0.26	0.00	2.03	-2.03	†	†	†
	15	H057101	0.75	0.29	0.32	†	†	†	†	†
H6	1	H031601	0.87	2.74	0.23	†	†	†	†	†
	3	H031801	0.49	0.48	0.00	-1.12	1.12	†	†	†
	4	H031802	0.73	0.43	0.00	0.34	-0.34	†	†	†
	9	H032101	0.63	-2.32	0.29	†	†	†	†	†
	11	H032301	0.68	0.73	0.00	0.25	-0.25	†	†	†
	12	H032401	0.60	-2.42	0.30	†	†	†	†	†
H7	3	H057401	1.05	1.49	0.24	†	†	†	†	†
	4	H057501	0.58	0.68	0.00	1.62	-1.62	†	†	†
	12	H058301	0.38	2.10	0.34	†	†	†	†	†
	13	H058401	0.91	0.10	0.40	†	†	†	†	†
	16	H058701	0.58	0.77	0.00	0.75	-0.75	†	†	†
H8	4	H034401	0.82	-0.69	0.00	†	†	†	†	†
	11	H035001	1.08	1.08	0.00	0.14	-0.14	†	†	†
	12	H035002	1.59	0.65	0.26	†	†	†	†	†
	13	H035101	0.69	-0.25	0.00	0.85	-0.85	†	†	†
† 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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