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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 12 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 12 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	H074101	2.11	1.55	0.42	†	†	†
	9	H074301	1.67	1.01	0.19	†	†	†
	11	H074501	2.10	1.75	0.52	†	†	†
	12	H074601	1.04	1.13	0.20	†	†	†
	16	H075001	0.63	-0.22	0.28	†	†	†
H4	9	H046301	0.62	2.25	†	†	†	†
	10	H046401	1.97	1.26	0.20	†	†	†
	11	H046402	1.05	0.76	0.25	†	†	†
	13	H046601	0.91	0.64	0.16	†	†	†
	14	H046701	0.78	0.71	0.17	†	†	†
	15	H046702	0.84	0.87	0.12	†	†	†
	16	H046801	1.14	0.39	0.21	†	†	†
H5	4	H062301	1.15	1.06	0.43	†	†	†
	14	H063301	0.76	0.67	0.21	†	†	†
H6	14	H049601	0.70	1.27	†	1.64	-0.57	-1.07
	15	H049701	1.04	0.96	†	-0.58	0.58	†
	16	H049801	1.12	1.31	0.12	†	†	†
H7	1	H075301	0.34	1.01	†	-0.27	0.27	†
	2	H075401	1.08	0.63	0.25	†	†	†
	4	H075601	1.18	1.05	0.23	†	†	†
	15	H076701	1.90	1.52	0.28	†	†	†
	17	H076901	1.37	1.04	0.24	†	†	†
H8	11	H052201	0.77	-0.15	0.27	†	†	†
	14	H052501	0.91	1.09	†	-0.21	0.21	†
	16	H052701	0.41	0.31	†	0.06	-0.06	†
	17	H052801	0.90	0.17	0.31	†	†	†
H9	14	H061701	1.32	0.60	0.22	†	†	†
	15	H061801	1.00	0.45	†	1.16	-1.16	†
H10	1	H041901	1.04	1.02	0.31	†	†	†
	5	H042201	0.85	2.08	†	0.21	-0.21	†
	6	H042301	1.72	1.28	0.24	†	†	†
	7	H042401	0.76	2.44	0.24	†	†	†
	15	H0429CL	0.42	-0.67	†	0.40	-0.14	-0.26
H11	1	H063801	0.76	-0.10	†	1.37	-1.37	†
	2	H063901	0.85	-2.15	0.25	†	†	†
	3	H064001	0.86	0.62	†	1.10	-1.10	†
	4	H064101	0.86	0.20	†	0.54	-0.54	†
	9	H064601	1.12	-0.78	0.21	†	†	†
	10	H064701	1.27	-1.03	0.28	†	†	†
	11	H064801	0.71	-1.11	0.17	†	†	†

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