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

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
H3	5	H035901	-0.50	-0.31	0.00	-0.43	-0.43	†	†	†
	6	H035902	-1.25	-0.66	0.00	†	†	†	†	†
	10	H036301	-1.09	-0.81	-0.28	†	†	†	†	†
	11	H036401	-1.00	-0.24	-0.31	†	†	†	†	†
	12	H036402	-0.63	-0.40	0.00	-0.76	-0.20	-0.96	†	†
	15	H036701	-0.53	-1.86	-0.28	†	†	†	†	†
	17	H036801	-0.40	-0.65	-0.23	†	†	†	†	†
H4	8	H059501	-0.74	-0.72	-0.23	†	†	†	†	†
	9	H059601	-0.68	-0.44	-0.26	†	†	†	†	†
	10	H059701	-0.80	-0.76	0.00	-0.20	-0.20	†	†	†
	12	H059901	-1.47	-0.03	-0.26	†	†	†	†	†
H5	9	H038401	-1.03	-1.35	-0.22	†	†	†	†	†
H6	9	H039901	-0.56	-0.27	0.00	-2.40	-1.69	-0.71	†	†
	11	H040101	-1.53	-2.06	-0.29	†	†	†	†	†
	12	H040102	-0.82	-0.56	-0.27	†	†	†	†	†
	13	H040103	-0.93	-1.40	0.00	-0.09	-0.09	†	†	†
	14	H040201	-0.62	-0.51	0.00	-0.60	-0.60	†	†	†
	17	H040501	-0.45	-0.83	-0.24	†	†	†	†	†
H7	3	H057401	-0.98	-0.04	-0.26	†	†	†	†	†
	4	H057501	-0.52	-0.62	0.00	-1.69	-1.69	†	†	†
	12	H058301	-0.83	-0.60	-0.37	†	†	†	†	†
	13	H058401	-0.90	-1.62	-0.34	†	†	†	†	†
	16	H058701	-0.54	-0.94	0.00	-0.99	-0.99	†	†	†
H8	4	H034401	-1.44	-1.75	0.00	†	†	†	†	†
	11	H035001	-0.75	-0.00	0.00	-0.03	-0.03	†	†	†
	12	H035002	-1.31	-0.59	-0.38	†	†	†	†	†
	13	H035101	-0.65	-1.59	0.00	-0.90	-0.90	†	†	†
H9	5	H060801	-0.85	-0.00	-0.29	†	†	†	†	†
	9	H061201	-1.29	-2.14	-0.29	†	†	†	†	†
H10	3	H042101	-0.44	-0.59	-0.27	†	†	†	†	†
	4	H042102	-1.22	-1.08	-0.33	†	†	†	†	†
	11	H042701	-0.82	-0.50	-0.26	†	†	†	†	†
	12	H042702	-0.89	-0.56	-0.19	†	†	†	†	†
	16	H043001	-0.46	-1.69	0.00	-0.46	-0.46	†	†	†
	17	H043101	-0.42	-1.24	0.00	-1.21	-1.21	†	†	†
† 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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