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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 8 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, by block and item, grade 8 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	4	G013402	0.91	1.24	†	0.43	-0.43	†
G3	5	G013501	1.25	0.66	0.25	†	†	†
G3	6	G013502	1.28	0.67	0.22	†	†	†
G3	11	G013901	0.89	0.15	0.21	†	†	†
G3	14	G014201	0.75	0.88	†	0.52	-0.06	-0.46
G4	2	G033001	0.66	-0.08	0.22	†	†	†
G4	7	G033501	0.33	-0.54	†	1.47	0.56	-2.04
G4	9	G033701	1.49	0.44	0.46	†	†	†
G4	14	G034201	1.62	1.37	0.33	†	†	†
G5	6	G016302	1.18	1.74	†	0.15	-0.15	†
G5	9	G016502	1.05	0.89	†	†	†	†
G5	10	G016601	0.85	0.97	0.24	†	†	†
G5	12	G016801	0.62	0.91	0.26	†	†	†
G5	16	G017101	0.93	1.52	†	-0.21	0.21	†
G5	18	G017301	1.02	0.38	0.27	†	†	†
G6	2	G034601	0.85	0.75	0.21	†	†	†
G6	4	G034801	0.77	1.26	†	0.36	-0.36	†
G6	5	G034901	0.81	0.97	0.28	†	†	†
G6	7	G035101	2.24	0.55	0.34	†	†	†
G6	8	G035201	1.61	0.72	0.22	†	†	†
G6	10	G035401	0.89	2.48	0.23	†	†	†
G6	12	G035601	1.73	1.23	0.26	†	†	†
G6	16	G036001	1.93	1.16	0.25	†	†	†
G7	2	G036201	0.76	0.74	†	1.06	-1.06	†
G7	4	G036401	1.50	0.12	0.34	†	†	†
G7	8	G036801	0.86	0.94	†	0.11	-0.11	†
G7	13	G037301	1.23	1.53	0.33	†	†	†
G8	7	G012501	2.59	0.97	0.24	†	†	†
G8	8	G012502	0.80	0.58	0.26	†	†	†
G8	9	G012503	0.96	-1.41	†	†	†	†
G8	11	G012701	1.27	0.51	0.35	†	†	†
G8	13	G012901	1.18	-0.16	0.20	†	†	†
G8	14	G012902	0.53	-0.77	†	†	†	†

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