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 12 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 12 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	10	H074401	0.73	0.62	†	0.73	-0.73	†	†	†
H4	3	H045701	1.00	0.69	0.23	†	†	†	†	†
	5	H045901	1.02	0.40	†	0.74	-0.74	†	†	†
	6	H046001	0.67	1.00	†	†	†	†	†	†
	12	H046501	1.33	1.11	0.19	†	†	†	†	†
	17	H046901	2.28	0.77	0.24	†	†	†	†	†
	18	H046902	2.49	0.95	0.31	†	†	†	†	†
H5	5	H062401	1.34	1.26	0.18	†	†	†	†	†
	6	H062501	1.67	1.28	0.37	†	†	†	†	†
	7	H062601	0.67	0.04	0.30	†	†	†	†	†
	9	H062801	1.03	1.53	0.11	†	†	†	†	†
	10	H062901	0.70	-0.07	0.28	†	†	†	†	†
	11	H063001	1.01	1.03	0.20	†	†	†	†	†
H6	1	H048601	0.55	-0.63	0.27	†	†	†	†	†
	2	H048701	0.61	0.19	0.21	†	†	†	†	†
	3	H048801Z	1.44	1.41	0.26	†	†	†	†	†
	4	H048901	0.48	1.51	†	-1.53	1.53	†	†	†
	6	H049101	0.89	0.65	0.25	†	†	†	†	†
	7	H049102	0.56	-1.33	0.22	†	†	†	†	†
	10	H049401	0.72	2.86	†	0.76	-0.40	-0.36	†	†
H7	5	H075701	0.75	0.19	†	1.71	-1.71	†	†	†
	8	H076001	0.70	0.69	0.23	†	†	†	†	†
	18	H077001Z	0.21	3.60	0.29	†	†	†	†	†
H8	1	H084701	0.35	0.53	0.23	†	†	†	†	†
	3	H095601	0.55	-0.02	0.22	†	†	†	†	†
	6	H091401	0.52	-0.93	0.25	†	†	†	†	†
	7	H093201	0.82	1.72	0.39	†	†	†	†	†
	15	H097001	0.45	0.93	†	2.04	-2.04	†	†	†
H9	3	H094001	0.55	0.88	0.28	†	†	†	†	†
	4	H094401	1.29	1.56	0.22	†	†	†	†	†
	6	H096001	0.89	1.76	0.18	†	†	†	†	†
	10	H094701	0.39	0.55	0.24	†	†	†	†	†
H10	2	H042001	0.88	0.91	0.22	†	†	†	†	†
	8	H042501	1.43	0.51	0.18	†	†	†	†	†
	9	H042601	0.92	-0.69	0.28	†	†	†	†	†
	10	H042602	1.07	1.75	0.07	†	†	†	†	†
	13	H042801	0.99	0.59	†	†	†	†	†	†
H11	12	H064901	0.63	0.25	†	0.50	-0.50	†	†	†

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