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NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → 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, Grade 8 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the economic and technological changes and their relation to society, ideas, and the environment scale, grade 8 U.S. history national main assessment, by item and block: 2006

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models. 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 represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2006 U.S. History Assessment.
H3	5	H035901	0.50	-0.31	†	0.51	-0.51	†
	6	H035902	1.14	0.74	†	†	†	†
	10	H036301	1.09	-0.78	0.25	†	†	†
	11	H036401	0.95	0.30	0.30	†	†	†
	12	H036402	0.56	0.49	†	0.81	0.26	-1.07
	15	H036701	0.55	-1.78	0.26	†	†	†
	17	H036801	0.40	0.40	0.21	†	†	†
H4	8	H059501	0.68	0.78	0.21	†	†	†
	9	H059601	0.72	-0.46	0.28	†	†	†
	10	H059701	0.83	0.81	†	-0.18	0.18	†
	12	H059901	1.21	-0.03	0.25	†	†	†
H5	9	H038401	1.71	1.25	0.23	†	†	†
H6	10	H069601	0.74	-0.02	†	1.14	-1.14	†
H7	3	H057401	1.11	0.04	0.27	†	†	†
	4	H057501	0.54	-0.67	†	1.79	-1.79	†
	12	H058301	0.80	0.51	0.38	†	†	†
	13	H058401	0.91	-1.64	0.34	†	†	†
	16	H058701	0.51	-0.94	†	1.08	-1.08	†
H8	4	H034401	1.26	-1.88	†	†	†	†
	11	H035001	0.72	-0.04	†	0.10	-0.10	†
	12	H035002	1.50	-0.45	0.41	†	†	†
	13	H035101	0.56	-1.33	†	0.30	-0.30	†
H9	5	H060801	0.77	0.07	0.30	†	†	†
	9	H061201	0.55	2.91	0.30	†	†	†
H10	3	H042101	0.37	-0.67	0.29	†	†	†
	4	H042102	1.44	1.05	0.32	†	†	†
	11	H042701	0.78	-0.60	0.23	†	†	†
	12	H042702	0.85	-0.58	0.17	†	†	†
	16	H043001	0.44	1.79	†	0.51	-0.51	†
	17	H043101	0.40	1.24	†	1.25	-1.25	†
H11	1	H070301	1.13	0.89	0.31	†	†	†
	2	H070401	0.68	0.93	†	0.46	-0.46	†
	4	H070601	1.23	0.55	0.23	†	†	†
	8	H071001	0.94	0.87	†	1.60	-0.84	-0.76
	9	H071101	0.71	1.53	0.20	†	†	†
	11	H071301	0.93	-0.85	0.25	†	†	†
	12	H071401	0.78	1.59	0.32	†	†	†
	13	H071501	0.60	3.93	0.35	†	†	†
	15	H071701	1.16	0.99	0.32	†	†	†
H12	1	H071901	0.83	0.07	†	0.05	-0.05	†
	2	H072001	1.08	0.36	0.39	†	†	†
	4	H072201	1.63	0.52	0.24	†	†	†
	5	H072301	1.47	0.16	0.24	†	†	†
	6	H072401	1.04	0.64	0.20	†	†	†
	8	H072601	0.73	2.13	†	0.89	-0.89	†
	9	H072701	0.70	0.27	†	1.41	-0.98	-0.44
	10	H072801	0.91	0.29	0.23	†	†	†
	11	H072901	1.48	0.88	0.21	†	†	†
	13	H073101	0.75	0.44	†	0.42	-0.42	†
	15	H073301	1.00	1.35	0.20	†	†	†

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