IRT Parameters for the Environment and Society Subscale, Grade 8 Geography National Assessment, by Item and Block: 2014

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NAEP Technical DocumentationIRT parameters for the environment and society subscale, grade 8 geography national assessment, by item and block: 2014
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
† 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	10	G013801	1.67	1.19	.19	†	†	†	†	†
	12	G014001	1.08	1.28	†	0.01	-0.01	†	†	†
	15	G014301	0.64	0.99	†	0.22	-0.22	†	†	†
G4	1	G032901	0.40	0.49	†	1.84	-1.84	†	†	†
	3	G033101	0.71	0.87	.26	†	†	†	†	†
	5	G033301	0.47	-0.17	†	-1.21	1.21	†	†	†
	6	G033401	1.10	0.49	.28	†	†	†	†	†
	8	G059701	2.06	1.28	.30	†	†	†	†	†
	10	G033801	0.43	-1.07	†	-0.83	0.83	†	†	†
	12	G034001	2.34	1.33	.26	†	†	†	†	†
	13	G034101	0.55	0.65	†	1.68	-1.68	†	†	†
G5	10	G050801	0.87	0.44	†	0.07	-0.07	†	†	†
G5	14	G050301	0.64	0.98	†	1.64	-0.05	-1.59	†	†
G6	3	G034701	1.06	0.61	.25	†	†	†	†	†
	6	G035001	0.68	0.77	†	1.50	-0.55	-0.95	†	†
	9	G035301	0.77	0.36	†	0.87	-0.41	-0.46	†	†
	13	G035701	0.92	1.58	.25	†	†	†	†	†
	14	G035801	0.93	1.58	.26	†	†	†	†	†
	15	G035901	0.84	1.41	.32	†	†	†	†	†
G7	9	G052401	0.82	0.34	.27	†	†	†	†	†
G8	5	G049401	0.51	0.64	†	0.29	-0.29	†	†	†
G8	10	G046301	0.32	0.58	†	0.23	2.03	-2.25	†	†
G9	4	G019003	0.56	-0.77	†	1.41	-1.41	†	†	†
	5	G019101	1.84	0.31	.34	†	†	†	†	†
	6	G019102	0.95	1.34	†	0.21	-0.21	†	†	†
	7	G019201	0.81	0.21	.31	†	†	†	†	†
	8	G019202	0.77	0.16	†	†	†	†	†	†
	20	G019901	0.24	0.34	†	3.97	1.06	-5.04	†	†
	21	G020001	0.74	2.51	†	0.54	-0.54	†	†	†
	23	G020201	0.56	1.28	†	1.52	-1.52	†	†	†
	25	G0203CL	0.57	0.75	†	0.27	0.09	-0.37	†	†

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