NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Geography Assessment IRT Parameters → IRT Parameters for the Spatial Dynamics and Connections Scale, Grade 8 Geography National Assessment, by Item and Block: 2010

NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, grade 8 geography 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: Single overall scale. 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 Geography Assessment.
G3	4	G013402	0.79	1.46	†	0.56	-0.56	†	†	†
	5	G013501	1.10	0.67	0.27	†	†	†	†	†
	6	G013502	1.17	0.77	0.22	†	†	†	†	†
	11	G013901	0.70	0.10	0.20	†	†	†	†	†
	14	G014201	0.64	0.96	†	0.71	-0.23	-0.48	†	†
G4	2	G033001	0.60	0.04	0.24	†	†	†	†	†
	7	G033501	0.30	-0.57	†	1.73	0.50	-2.24	†	†
	9	G033701	1.34	0.38	0.46	†	†	†	†	†
	14	G034201	1.31	1.33	0.30	†	†	†	†	†
G5	4	G046501	1.10	1.09	0.28	†	†	†	†	†
	7	G048702	0.61	-0.26	†	†	†	†	†	†
	8	G047301	0.99	-0.66	0.24	†	†	†	†	†
	9	G047302	0.68	1.20	0.27	†	†	†	†	†
	11	G048401	0.86	-0.74	0.28	†	†	†	†	†
	13	G050701	1.10	0.48	0.24	†	†	†	†	†
	16	G051101	0.17	3.26	0.31	†	†	†	†	†
G6	2	G034601	0.71	0.67	0.18	†	†	†	†	†
	4	G034801	0.67	1.45	†	0.53	-0.53	†	†	†
	5	G034901	0.72	1.11	0.25	†	†	†	†	†
	7	G035101	1.69	0.55	0.36	†	†	†	†	†
	8	G035201	1.22	0.81	0.23	†	†	†	†	†
	10	G035401	0.59	1.95	0.24	†	†	†	†	†
	12	G035601	1.01	1.29	0.23	†	†	†	†	†
	16	G036001	1.42	1.19	0.24	†	†	†	†	†
G7	10	G053601	0.65	1.54	†	-0.53	0.53	†	†	†
	11	G053501	0.72	0.10	0.28	†	†	†	†	†
	13	G052001	1.21	0.31	0.31	†	†	†	†	†
	14	G052801	0.91	-0.52	0.32	†	†	†	†	†
G8	4	G046401	0.62	1.42	0.21	†	†	†	†	†
	6	G049301	0.65	0.47	0.22	†	†	†	†	†
	7	G048101	0.64	1.04	†	0.49	-0.49	†	†	†
	11	G049601	0.45	-1.27	0.28	†	†	†	†	†
	12	G049701	0.51	1.03	†	-0.25	0.25	†	†	†
	15	G049101	0.80	1.49	0.29	†	†	†	†	†
	16	G051201	1.88	1.09	0.15	†	†	†	†	†

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