NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Gathering of Interactions of Peoples, Cultures, and Ideas Scale, Grade 12 U.S. History National Assessment, by Item and Block: 2010

NAEP Technical DocumentationIRT parameters for the gathering of interactions of peoples, cultures, and ideas 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	2	H073601	1.58	1.02	0.25	†	†	†	†	†
	3	H073701	1.37	0.76	0.38	†	†	†	†	†
	5	H073901	0.85	-0.72	0.22	†	†	†	†	†
	6	H074001	0.41	-0.17	†	-1.48	1.48	†	†	†
	17	H075101	0.47	1.20	†	1.55	-0.11	-1.44	†	†
	18	H075201	0.99	1.03	0.21	†	†	†	†	†
H4	1	H045509	0.51	0.56	†	0.54	-0.54	†	†	†
	7	H046101	0.38	2.29	†	†	†	†	†	†
H5	2	H062101	0.62	2.66	0.18	†	†	†	†	†
	15	H063401	0.61	-0.14	†	0.99	0.24	-1.23	†	†
H6	5	H049001	0.44	0.06	0.31	†	†	†	†	†
	8	H049201	1.10	1.37	0.18	†	†	†	†	†
	9	H049301	0.99	0.81	0.27	†	†	†	†	†
	11	H049501	0.98	-1.17	0.20	†	†	†	†	†
	12	H049502	0.63	0.54	0.20	†	†	†	†	†
	13	H049503	0.90	1.71	†	0.80	-0.80	†	†	†
H7	6	H075801	0.75	0.68	0.12	†	†	†	†	†
	9	H076101	0.47	0.61	0.19	†	†	†	†	†
	10	H076201	1.37	-0.09	0.15	†	†	†	†	†
	14	H076601	0.64	1.03	0.14	†	†	†	†	†
H8	2	H095901	0.63	0.65	†	0.61	-0.61	†	†	†
	11	H093501	0.40	-0.19	†	1.65	-0.39	-1.26	†	†
H9	1	H091301	0.47	-1.42	0.21	†	†	†	†	†
	7	H096201	1.01	0.21	0.24	†	†	†	†	†
	8	H096401	1.51	0.46	0.22	†	†	†	†	†
	11	H091901	0.17	3.18	0.25	†	†	†	†	†
	15	H093601	1.51	0.74	0.12	†	†	†	†	†
	16	H095401	0.49	1.14	†	1.09	-0.06	-1.02	†	†
H11	13	H065001	0.98	-0.66	0.22	†	†	†	†	†
	14	H065101	0.82	0.68	†	0.75	-0.75	†	†	†
	15	H065201	0.64	0.05	†	0.63	-0.63	†	†	†
	16	H065301Z	0.69	0.52	†	0.39	-0.39	†	†	†
	17	H065401	0.53	0.36	†	1.09	-0.76	-0.33	†	†

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