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NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → NAEP Assessment IRT Parameters → Geography Assessment IRT Parameters → IRT Parameters for the Spatial Dynamics and Connections Scale, by Block and Item, Grade 12 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, by block and item, grade 12 geography national main assessment (accommodations permitted [R3]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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 is the category threshold parameter for category i. The c-parameter value is exactly zero for items scaled with the two-parameter logistic model or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress NAEP, 2001 Geography Assessment.
G3	1	G020501	0.87	-1.29	0.29	†	†	†
G3	6	G020802	1.01	-1.61	0.25	†	†	†
G3	7	G020901	0.58	-1.18	0.22	†	†	†
G3	11	G021301	0.90	0.24	0.33	†	†	†
G3	13	G021501	0.92	0.21	0.25	†	†	†
G4	1	G0375CL	0.48	-0.43	†	1.67	-0.71	-0.97
G4	3	G038101	0.35	2.66	†	3.00	-3.00	†
G4	4	G038201	0.98	0.26	0.22	†	†	†
G4	7	G038501	0.75	0.61	0.37	†	†	†
G4	8	G038601	1.27	0.81	0.28	†	†	†
G4	11	G038901	0.54	0.82	0.34	†	†	†
G4	17	G039501	1.59	1.37	0.18	†	†	†
G5	6	G016302	0.95	1.25	†	0.49	-0.49	†
G5	9	G016502	0.78	-0.02	†	†	†	†
G5	10	G016601	0.77	-0.11	0.19	†	†	†
G5	12	G016801	0.52	0.18	0.26	†	†	†
G5	16	G017101	0.56	0.44	†	0.89	-0.57	-0.32
G5	18	G017301	0.78	-0.48	0.26	†	†	†
G6	2	G034601	0.53	0.20	0.21	†	†	†
G6	4	G034801	0.37	0.25	†	0.41	0.98	-1.39
G6	5	G034901	0.78	0.06	0.29	†	†	†
G6	7	G035101	1.88	-0.12	0.36	†	†	†
G6	8	G035201	0.94	-0.35	0.23	†	†	†
G6	10	G035401	0.64	1.23	0.24	†	†	†
G6	12	G035601	1.47	0.90	0.32	†	†	†
G6	16	G036001	1.20	0.53	0.23	†	†	†
G7	6	G040101	0.57	0.16	0.30	†	†	†
G7	7	G040201	0.78	1.23	0.23	†	†	†
G7	8	G040301	0.53	1.42	†	0.68	0.15	-0.82
G7	13	G040801	1.19	0.87	0.20	†	†	†
G7	14	G040901	0.94	1.52	0.24	†	†	†
G8	2	G024801	1.27	0.29	0.22	†	†	†
G8	8	G025201	1.34	0.94	0.32	†	†	†
G8	9	G025202	0.91	0.71	†	0.81	-0.81	†
G8	13	G025501	1.20	0.24	0.18	†	†	†
G8	14	G025502	0.79	-0.21	0.23	†	†	†
G8	15	G025601	0.65	1.85	†	-0.17	0.17	†
G8	17	G025801	1.06	2.08	†	†	†	†

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