NAEP Analysis and Scaling → Estimation of NAEP Score Scales → 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 Assessment, by Item and Block: 2010

NAEP Technical DocumentationIRT parameters for the change and continuity in American democracy: ideas, institutions, practices, and controversies scale, grade 8 U.S. history national assessment, by item and block: 2010

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
† 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), 2010 U.S. History Assessment.
H3	3	H035701	1.04	1.18	0.20	†	†	†	†	†
	4	H035801	0.69	1.71	†	-0.21	0.21	†	†	†
	14	H036601	0.52	1.70	0.14	†	†	†	†	†
H4	1	H058801	0.33	1.07	0.19	†	†	†	†	†
	2	H058901	0.46	2.78	0.30	†	†	†	†	†
	3	H059001	0.76	0.44	†	0.13	-0.13	†	†	†
	5	H059201	0.58	0.47	†	0.17	-0.17	†	†	†
	6	H059301	0.54	1.18	0.17	†	†	†	†	†
	15	H060201	0.54	0.40	†	0.23	-0.23	†	†	†
H5	1	H037901	0.52	0.47	0.22	†	†	†	†	†
	2	H038001	1.04	-1.69	0.23	†	†	†	†	†
	3	H038101	0.46	0.59	0.25	†	†	†	†	†
	4	H038102	1.55	0.72	0.21	†	†	†	†	†
	5	H038103	0.52	1.85	†	-0.65	0.23	0.42	†	†
	6	H038201	1.24	0.56	0.20	†	†	†	†	†
	7	H038202	0.88	0.07	0.20	†	†	†	†	†
	17	H039001	0.68	1.55	†	-0.20	0.20	†	†	†
H6	3	H068901	0.81	1.74	0.23	†	†	†	†	†
	8	H069401	0.54	1.17	†	0.27	-0.27	†	†	†
	13	H069901	0.75	1.79	0.18	†	†	†	†	†
H7	1	H081801	0.36	1.67	0.24	†	†	†	†	†
	3	H084901	0.73	0.74	†	0.17	-0.17	†	†	†
	11	H090501	0.37	-0.14	0.21	†	†	†	†	†
	13	H084301	0.41	1.48	†	1.07	-0.54	-0.52	†	†
H8	3	H097801	0.39	1.22	†	1.03	-1.24	0.21	†	†
	8	H082501	0.39	1.24	0.22	†	†	†	†	†
	10	H082701	0.39	0.59	0.21	†	†	†	†	†
	11	H082702	0.86	-0.64	0.20	†	†	†	†	†
	12	H082901	0.57	0.56	†	0.28	-0.28	†	†	†
	13	H087101	0.49	0.55	0.20	†	†	†	†	†
	16	H091101	0.60	0.77	†	0.27	0.17	-0.44	†	†
H9	10	H083501	0.41	2.27	0.27	†	†	†	†	†
	12	H085501	0.38	1.11	0.22	†	†	†	†	†
H10	2	H042001	0.62	1.45	0.15	†	†	†	†	†
	8	H042501	1.07	1.45	0.18	†	†	†	†	†
	9	H042601	0.53	-0.47	0.25	†	†	†	†	†
	10	H042602	1.21	2.20	0.09	†	†	†	†	†
	13	H042801	0.91	1.94	†	†	†	†	†	†
H11	3	H070501	0.59	1.57	0.19	†	†	†	†	†
	10	H071201	0.71	2.32	0.24	†	†	†	†	†
	16	H071801	0.86	1.13	0.23	†	†	†	†	†
H12	3	H072101	0.40	0.08	0.18	†	†	†	†	†
	7	H072501	0.42	0.72	0.21	†	†	†	†	†
	14	H073201	0.45	0.53	0.20	†	†	†	†	†

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