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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 8 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 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 8 U.S. history national main assessment (accommodations not permitted [R2]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
H3	5	H035901	0.50	-0.26	0.00	0.45	-0.45	†	†	†
	6	H035902	0.99	0.72	0.00	†	†	†	†	†
	10	H036301	1.11	-0.84	0.32	†	†	†	†	†
	11	H036401	0.89	0.12	0.25	†	†	†	†	†
	12	H036402	0.61	0.38	0.00	0.78	0.23	-1.01	†	†
	15	H036701	0.57	-1.70	0.28	†	†	†	†	†
	17	H036801	0.42	0.47	0.23	†	†	†	†	†
H4	8	H059501	0.75	0.83	0.25	†	†	†	†	†
	9	H059601	0.67	-0.36	0.32	†	†	†	†	†
	10	H059701	0.91	0.74	0.00	-0.15	0.15	†	†	†
	12	H059901	1.34	0.11	0.31	†	†	†	†	†
H5	9	H038401	1.21	1.26	0.24	†	†	†	†	†
H6	9	H039901	0.57	0.27	0.00	2.25	-1.53	-0.73	†	†
	11	H040101	1.26	1.90	0.27	†	†	†	†	†
	12	H040102	0.93	-0.49	0.32	†	†	†	†	†
	13	H040103	0.88	1.39	0.00	0.10	-0.10	†	†	†
	14	H040201	0.57	0.53	0.00	-0.59	0.59	†	†	†
	17	H040501	0.48	0.61	0.23	†	†	†	†	†
H7	3	H057401	0.89	-0.15	0.23	†	†	†	†	†
	4	H057501	0.53	-0.63	0.00	1.62	-1.62	†	†	†
	12	H058301	0.92	0.64	0.37	†	†	†	†	†
	13	H058401	0.88	-1.75	0.32	†	†	†	†	†
	16	H058701	0.49	-1.08	0.00	1.16	-1.16	†	†	†
H8	4	H034401	1.24	-2.00	0.00	†	†	†	†	†
	11	H035001	0.74	-0.03	0.00	0.12	-0.12	†	†	†
	12	H035002	1.48	-0.59	0.35	†	†	†	†	†
	13	H035101	0.57	-1.80	0.00	1.03	-1.03	†	†	†
H9	5	H060801	0.90	-0.05	0.26	†	†	†	†	†
	9	H061201	1.09	2.21	0.29	†	†	†	†	†
H10	3	H042101	0.45	-0.47	0.27	†	†	†	†	†
	4	H042102	1.09	1.20	0.33	†	†	†	†	†
	11	H042701	0.83	-0.48	0.22	†	†	†	†	†
	12	H042702	0.97	-0.69	0.18	†	†	†	†	†
	16	H043001	0.40	1.92	0.00	0.61	-0.61	†	†	†
	17	H043101	0.36	1.25	0.00	1.40	-1.40	†	†	†
† 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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