NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections subscale, grade 8 geography 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 Geography Assessment.
G3	4	G013402	0.73	1.68	†	0.68	-0.68	†	†	†
	5	G013501	1.09	0.69	.29	†	†	†	†	†
	6	G013502	1.14	0.87	.25	†	†	†	†	†
	11	G013901	0.62	0.14	.24	†	†	†	†	†
	14	G014201	0.54	1.06	†	0.95	-0.32	-0.63	†	†
G4	2	G033001	0.62	0.36	.30	†	†	†	†	†
	7	G033501	0.29	-0.67	†	2.06	0.48	-2.54	†	†
	9	G033701	0.99	0.10	.41	†	†	†	†	†
	14	G034201	0.97	1.21	.25	†	†	†	†	†
G5	4	G046501	1.04	1.27	.31	†	†	†	†	†
	7	G048702	0.57	-0.30	†	†	†	†	†	†
	8	G047301	0.88	-0.87	.23	†	†	†	†	†
	9	G047302	0.53	1.24	.26	†	†	†	†	†
	11	G048401	0.70	-0.87	.27	†	†	†	†	†
	13	G050701	0.94	0.50	.22	†	†	†	†	†
	16	G051101	0.17	2.72	.32	†	†	†	†	†
G6	2	G034601	0.72	0.61	.17	†	†	†	†	†
	4	G034801	0.43	0.91	†	0.98	0.89	-1.87	†	†
	5	G034901	0.66	1.13	.21	†	†	†	†	†
	7	G035101	1.23	0.50	.35	†	†	†	†	†
	8	G035201	1.01	0.83	.23	†	†	†	†	†
	10	G035401	0.50	2.27	.25	†	†	†	†	†
	12	G035601	0.78	1.19	.21	†	†	†	†	†
	16	G036001	1.26	1.06	.23	†	†	†	†	†
G7	10	G053601	0.70	1.35	†	†	†	†	†	†
	11	G053501	0.81	0.28	.36	†	†	†	†	†
	13	G052001	1.03	0.22	.31	†	†	†	†	†
	14	G052801	0.96	-0.50	.38	†	†	†	†	†
G8	4	G046401	0.58	1.47	.21	†	†	†	†	†
	6	G049301	0.55	0.53	.23	†	†	†	†	†
	7	G048101	0.63	1.03	†	0.52	-0.52	†	†	†
	11	G049601	0.33	-0.91	.30	†	†	†	†	†
	12	G049701	0.46	1.12	†	-0.33	0.33	†	†	†
	15	G049101	0.56	1.73	.26	†	†	†	†	†
	16	G051201	1.74	1.13	.17	†	†	†	†	†

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