NAEP Technical DocumentationIRT parameters for the peoples, cultures, and ideas 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	1	H035601	1.19	-0.40	.31	†	†	†	†	†
	2	H035602	1.23	0.27	.23	†	†	†	†	†
	9	H036201	0.42	-1.64	.23	†	†	†	†	†
	16	H036702	1.14	-1.91	.23	†	†	†	†	†
H4	4	H059101	0.65	0.71	.22	†	†	†	†	†
	7	H059401	1.27	0.64	.33	†	†	†	†	†
	11	H059801	0.77	-0.12	†	-0.28	0.28	†	†	†
	14	H060101	0.79	1.41	.34	†	†	†	†	†
	16	H060301	1.04	-0.17	.20	†	†	†	†	†
H5	10	H038501	1.00	0.84	.24	†	†	†	†	†
	11	H038601	0.39	2.80	†	1.25	-1.25	†	†	†
	14	H038801	1.04	0.85	.22	†	†	†	†	†
	15	H038802	0.80	-0.34	.22	†	†	†	†	†
	16	H038901	1.09	0.59	.21	†	†	†	†	†
H6	4	H069001	0.68	0.33	†	0.54	-0.54	†	†	†
	5	H069101	0.57	0.45	.30	†	†	†	†	†
	6	H069201	0.46	-0.52	.23	†	†	†	†	†
	7	H069301	0.92	0.36	.20	†	†	†	†	†
	11	H069701	0.84	-0.37	.17	†	†	†	†	†
	12	H069801	0.46	0.02	†	1.55	-0.13	-1.42	†	†
	15	H070101	0.84	0.73	.22	†	†	†	†	†
H7	5	H082301	0.44	0.11	†	0.06	-0.06	†	†	†
	6	H085101	1.15	-0.20	.21	†	†	†	†	†
	7	H089901	1.53	0.34	.22	†	†	†	†	†
	8	H085201	0.66	-0.15	.23	†	†	†	†	†
	12	H085701	0.74	0.41	.20	†	†	†	†	†
	17	H086201	1.29	0.00	.24	†	†	†	†	†
H8	1	H081901	0.86	0.09	.22	†	†	†	†	†
	2	H088101	0.73	0.93	.23	†	†	†	†	†
	4	H083301	0.86	-0.76	.31	†	†	†	†	†
	6	H088401	0.56	0.34	†	1.16	0.29	-1.45	†	†
	9	H087201	1.98	1.14	.19	†	†	†	†	†
	15	H084401	0.63	1.15	.20	†	†	†	†	†
H9	1	H083101	1.35	0.19	.28	†	†	†	†	†
	2	H084801	1.02	1.55	†	0.70	-0.70	†	†	†
	4	H082401	1.04	0.61	.21	†	†	†	†	†
	5	H082402	0.68	0.95	†	-1.32	1.32	†	†	†
	6	H082201	1.09	1.29	.24	†	†	†	†	†
	7	H088301	0.69	1.86	†	0.66	-0.66	†	†	†
	9	H087001	0.39	2.24	.23	†	†	†	†	†
	13	H082801	0.47	1.00	.22	†	†	†	†	†
	14	H087501	0.22	3.34	.23	†	†	†	†	†
	15	H087401	0.52	2.17	†	2.54	0.23	-2.77	†	†
H11	5	H070701	0.44	1.72	†	-2.83	1.66	1.17	†	†
	6	H070801	0.68	1.39	†	0.88	-0.88	†	†	†
	7	H070901	1.28	0.90	.17	†	†	†	†	†
	14	H071601	0.53	1.00	†	0.50	-0.50	†	†	†
H12	12	H073001	0.43	0.44	†	0.32	-0.32	†	†	†
	16	H073401	0.64	0.61	.17	†	†	†	†	†

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