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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 Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies Scale, Grade 12 U.S. History National Main Assessment, by Item and Block: 2006

NAEP Technical DocumentationIRT parameters for the change and continuity in American democracy: ideas, institutions, practices, and controversies 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	10	H074401	0.75	0.64	†	0.66	-0.66	†
H4	3	H045701	0.83	0.61	0.18	†	†	†
	5	H045901	0.97	0.41	†	0.74	-0.74	†
	6	H046001	0.63	1.03	†	†	†	†
	12	H046501	1.48	1.15	0.18	†	†	†
	17	H046901	1.89	0.83	0.23	†	†	†
	18	H046902	1.93	1.02	0.31	†	†	†
H5	5	H062401	1.27	1.31	0.19	†	†	†
	6	H062501	0.99	1.21	0.34	†	†	†
	7	H062601	0.59	0.03	0.29	†	†	†
	9	H062801	1.14	1.42	0.10	†	†	†
	10	H062901	0.75	-0.03	0.26	†	†	†
	11	H063001	1.02	1.26	0.22	†	†	†
H6	1	H048601	0.50	-0.59	0.26	†	†	†
	2	H048701	0.64	0.49	0.23	†	†	†
	3	H048801	1.27	1.39	0.19	†	†	†
	4	H048901	0.49	1.42	†	-1.63	1.63	†
	6	H049101	0.88	0.68	0.25	†	†	†
	7	H049102	0.51	-1.50	0.21	†	†	†
	10	H049401	0.69	2.51	†	0.35	-0.35	0.00
H7	5	H075701	0.78	0.21	†	1.72	-1.72	†
	8	H076001	0.61	0.73	0.20	†	†	†
	18	H077001	0.79	2.77	0.35	†	†	†
H8	2	H051401	1.39	1.98	0.30	†	†	†
	3	H051501	1.52	0.86	0.24	†	†	†
	4	H051601	1.13	1.21	0.12	†	†	†
	8	H052001	0.80	-0.60	0.20	†	†	†
	13	H052401	1.61	1.56	0.21	†	†	†
H9	3	H060601	0.71	0.00	0.17	†	†	†
	4	H060701	0.96	0.69	†	0.17	-0.17	†
	11	H061401	0.70	-1.22	0.23	†	†	†
	12	H061501	0.63	-0.19	†	0.40	-0.40	†
	16	H061901	0.75	-0.12	0.28	†	†	†
H10	2	H042001	0.72	0.87	0.19	†	†	†
	8	H042501	1.20	0.40	0.13	†	†	†
	9	H042601	0.87	-0.73	0.30	†	†	†
	10	H042602	1.01	1.69	0.08	†	†	†
	13	H042801	0.98	0.60	†	†	†	†
H11	12	H064901	0.68	0.29	†	0.47	-0.47	†

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