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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 Changing Role of America in the World Scale, Grade 8 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the changing role of America in the world 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	7	H036001	1.43	0.33	0.33	†	†	†
	8	H036101	0.95	-0.62	†	†	†	†
	13	H036501	1.22	0.08	0.24	†	†	†
H4	13	H060001	1.15	1.97	0.25	†	†	†
H5	8	H038301	0.85	0.51	†	-0.25	0.25	†
	12	H038701	0.48	-0.91	0.24	†	†	†
	13	H038702	0.73	1.59	†	0.83	-0.83	†
H6	1	H068701	0.85	-0.09	0.30	†	†	†
	2	H068801	0.64	1.47	0.33	†	†	†
	9	H069501	0.52	1.23	0.26	†	†	†
	14	H070001	0.76	0.77	†	†	†	†
	16	H070201	1.49	1.29	0.19	†	†	†
H7	14	H058501	0.54	0.72	0.27	†	†	†
H8	1	H034101	0.81	0.25	†	2.96	-0.86	-2.10
	5	H034501	1.24	0.78	†	†	†	†
	14	H035201	0.92	0.29	0.24	†	†	†
	17	H035501	0.56	-0.79	0.25	†	†	†
H9	14	H061701	0.68	1.53	0.16	†	†	†
	15	H061801	0.87	1.72	†	1.17	-1.17	†
H10	1	H041901	1.10	1.62	0.31	†	†	†
	5	H042201	0.77	2.36	†	0.55	-0.55	†
	6	H042301	0.49	2.89	0.25	†	†	†
	7	H042401	0.45	2.24	0.19	†	†	†
	14	H0429CL	0.50	0.22	†	0.64	-0.17	-0.47

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