NAEP Analysis and Scaling - IRT Parameters for the Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies Scale, Grade 8 U.S. History National Main Assessment, by Item and Block: 2006

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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 8 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 8 U.S. history national main assessment, by item and block: 2006
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3
† 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, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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, d_ji 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	3	H035701	1.35	1.38	0.25	†	†	†
	4	H035801	0.81	1.74	†	-0.13	0.13	†
	14	H036601	0.55	1.42	0.14	†	†	†
H4	1	H058801	0.40	1.26	0.22	†	†	†
	2	H058901	0.82	2.31	0.31	†	†	†
	3	H059001	0.79	0.62	†	0.07	-0.07	†
	5	H059201	0.58	0.41	†	0.21	-0.21	†
	6	H059301	0.68	0.98	0.16	†	†	†
	15	H060201	0.52	0.39	†	0.07	-0.07	†
H5	1	H037901	0.74	0.83	0.32	†	†	†
	2	H038001	0.94	-1.65	0.25	†	†	†
	3	H038101	0.82	1.13	0.37	†	†	†
	4	H038102	1.77	0.81	0.21	†	†	†
	5	H038103	0.55	1.83	†	-0.82	0.31	0.51
	6	H038201	1.26	0.67	0.19	†	†	†
	7	H038202	0.95	0.38	0.26	†	†	†
	17	H039001	0.76	1.45	†	-0.08	0.08	†
H6	3	H068901	1.06	1.64	0.24	†	†	†
	8	H069401	0.51	1.34	†	0.32	-0.32	†
	13	H069901	0.78	1.96	0.20	†	†	†
H7	5	H057601	0.65	-0.26	0.18	†	†	†
	9	H058001	0.58	-0.28	0.21	†	†	†
	10	H058101	1.09	0.35	0.37	†	†	†
	11	H058201	0.72	0.14	0.24	†	†	†
	15	H058601	0.36	-0.82	†	0.80	-0.80	†
H8	7	H034701	0.66	-0.70	0.32	†	†	†
	8	H034702	0.82	1.60	†	0.49	-0.49	†
	9	H034801	0.96	-0.35	0.32	†	†	†
	10	H034901	0.44	-2.44	0.24	†	†	†
	15	H035301	0.40	0.35	0.22	†	†	†
	16	H035401	0.70	-1.23	0.22	†	†	†
H9	3	H060601	0.66	0.64	0.19	†	†	†
	4	H060701	0.96	1.31	†	0.27	-0.27	†
	11	H061401	0.75	-0.58	0.24	†	†	†
	12	H061501	0.58	1.22	†	0.14	-0.14	†
	16	H061901	0.58	0.89	0.21	†	†	†
H10	2	H042001	0.95	1.37	0.21	†	†	†
	8	H042501	0.94	1.51	0.17	†	†	†
	9	H042601	0.55	-0.22	0.28	†	†	†
	10	H042602	1.31	2.14	0.09	†	†	†
	13	H042801	1.14	1.86	†	†	†	†
H11	3	H070501	0.85	1.54	0.21	†	†	†
	10	H071201	0.84	2.39	0.24	†	†	†
	16	H071801	0.99	1.17	0.22	†	†	†
H12	3	H072101	0.43	0.36	0.23	†	†	†
	7	H072501	0.41	0.83	0.24	†	†	†
	14	H073201	0.54	0.76	0.24	†	†	†

Last updated 10 December 2009 (JL)

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