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 12 Geography National Assessment, by Item and Block: 2010

NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, grade 12 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	1	G020501	0.90	-1.24	0.34	†	†	†	†	†
	6	G020802	1.16	-1.53	0.24	†	†	†	†	†
	7	G020901	0.60	-1.30	0.20	†	†	†	†	†
	11	G021301	0.93	0.24	0.33	†	†	†	†	†
	13	G021501	0.73	0.24	0.24	†	†	†	†	†
G4	1	G0375CL	0.48	-0.51	†	1.53	-0.67	-0.87	†	†
	3	G038101	0.53	-1.34	†	†	†	†	†	†
	4	G038201	1.01	0.21	0.25	†	†	†	†	†
	7	G038501	0.71	0.73	0.36	†	†	†	†	†
	8	G038601	1.15	0.80	0.26	†	†	†	†	†
	11	G038901	0.49	1.02	0.36	†	†	†	†	†
	17	G039501	1.55	1.57	0.21	†	†	†	†	†
G5	2	G055001	0.91	0.77	0.20	†	†	†	†	†
	5	G055201	0.52	-0.13	†	0.26	0.47	-0.74	†	†
	7	G055401	1.66	1.04	0.17	†	†	†	†	†
	9	G055501	0.58	0.72	†	1.32	-1.32	†	†	†
	10	G053901	1.50	0.03	0.22	†	†	†	†	†
	11	G055301	0.40	-1.26	†	-0.51	-0.23	0.74	†	†
	12	G055302	0.90	0.90	0.24	†	†	†	†	†
	13	G055303	0.57	1.52	0.26	†	†	†	†	†
	14	G054001	0.73	1.10	0.21	†	†	†	†	†
	15	G054002	0.60	0.88	†	0.09	-0.09	†	†	†
G6	2	G034601	0.53	0.09	0.21	†	†	†	†	†
	4	G034801	0.38	0.35	†	0.41	1.20	-1.61	†	†
	5	G034901	0.74	0.01	0.27	†	†	†	†	†
	7	G035101	1.66	-0.09	0.41	†	†	†	†	†
	8	G035201	0.97	-0.47	0.20	†	†	†	†	†
	10	G035401	0.49	1.15	0.22	†	†	†	†	†
	12	G035601	0.87	0.74	0.27	†	†	†	†	†
	16	G036001	1.07	0.45	0.23	†	†	†	†	†
G7	6	G058001	0.94	0.06	0.23	†	†	†	†	†
	12	G057701	1.02	0.97	0.28	†	†	†	†	†
G8	2	G024801	1.00	0.21	0.21	†	†	†	†	†
	8	G025201	1.40	0.98	0.31	†	†	†	†	†
	9	G025202	0.84	0.79	†	0.86	-0.86	†	†	†
	13	G025501	1.15	0.12	0.17	†	†	†	†	†
	14	G025502	0.85	-0.06	0.25	†	†	†	†	†
	15	G025601	0.59	1.96	†	-0.47	0.47	†	†	†
	17	G025801	1.08	2.27	†	†	†	†	†	†

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