NAEP Technical DocumentationIRT parameters for the American world role subscale, grade 8 U.S. history national assessment, by item and block: 2014

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
† Not applicable; c parameters are not estimated for the two-parameter logistic model or generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter 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 is assumed to be exactly zero and is not estimated for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding. In 2014, grades 4 and 12 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 U.S. History Assessment.
H3	7	H036001	1.19	0.45	.37	†	†	†	†	†
	8	H036101	0.80	-0.81	†	†	†	†	†	†
	13	H036501	1.28	0.23	.31	†	†	†	†	†
H4	13	H060001	1.02	1.93	.22	†	†	†	†	†
H5	8	H038301	0.66	0.40	†	-0.52	0.52	†	†	†
	12	H038701	0.46	-1.12	.30	†	†	†	†	†
	13	H038702	0.67	1.67	†	1.02	-1.02	†	†	†
H6	1	H068701	0.66	-0.27	.30	†	†	†	†	†
	2	H068801	0.60	1.52	.39	†	†	†	†	†
	9	H069501	0.50	1.43	.34	†	†	†	†	†
	14	H070001	0.56	0.65	†	†	†	†	†	†
	16	H070201	2.06	1.09	.17	†	†	†	†	†
H7	2	H077301	0.97	1.72	.31	†	†	†	†	†
	4	H088201	1.27	-0.12	.36	†	†	†	†	†
	9	H090201	0.56	1.22	†	-0.38	0.27	0.11	†	†
	14	H089201	0.70	3.72	.39	†	†	†	†	†
	15	H087901	1.28	-0.16	.27	†	†	†	†	†
	16	H089501	0.81	0.38	.32	†	†	†	†	†
H8	5	H085001	0.84	0.18	.27	†	†	†	†	†
	7	H090101	0.67	1.32	.25	†	†	†	†	†
	14	H083901	0.90	0.65	.26	†	†	†	†	†
	17	H086301	0.94	0.09	.32	†	†	†	†	†
H9	3	H097901	0.75	-0.27	†	0.33	-0.33	†	†	†
	8	H083401	0.86	0.18	.27	†	†	†	†	†
	11	H083701	0.98	0.96	.31	†	†	†	†	†
	16	H084601	1.30	1.21	.21	†	†	†	†	†
	17	H087701	1.39	1.49	.31	†	†	†	†	†
H10	1	H041901	1.35	1.52	.29	†	†	†	†	†
	5	H042201	0.92	1.86	†	0.54	-0.54	†	†	†
	6	H042301	0.70	1.83	.23	†	†	†	†	†
	7	H042401	0.76	1.94	.23	†	†	†	†	†
	15	H0429CL	0.34	0.13	†	0.56	0.07	-0.63	†	†

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