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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 Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, by block and item, grade 8 geography national main assessment (accommodations not permitted [R2]): 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	0.83	1.36	0.00	0.53	-0.53	†
G3	5	G013501	1.59	0.69	0.34	†	†	†
G3	6	G013502	1.54	0.74	0.24	†	†	†
G3	11	G013901	0.89	0.12	0.23	†	†	†
G3	14	G014201	0.66	0.88	0.00	0.56	-0.10	-0.46
G4	2	G033001	0.64	-0.01	0.29	†	†	†
G4	7	G033501	0.30	-0.69	0.00	1.62	0.60	-2.22
G4	9	G033701	1.00	0.24	0.42	†	†	†
G4	14	G034201	1.26	1.41	0.31	†	†	†
G5	6	G016302	1.25	1.60	0.00	0.09	-0.09	†
G5	9	G016502	0.74	1.68	0.00	0.44	-0.44	†
G5	10	G016601	0.94	0.96	0.25	†	†	†
G5	12	G016801	0.48	1.33	0.27	†	†	†
G5	16	G017101	1.06	1.40	0.00	-0.23	0.23	†
G5	18	G017301	1.06	0.60	0.34	†	†	†
G6	2	G034601	0.92	0.76	0.23	†	†	†
G6	4	G034801	0.75	1.24	0.00	0.39	-0.39	†
G6	5	G034901	0.89	0.99	0.29	†	†	†
G6	7	G035101	2.04	0.50	0.31	†	†	†
G6	8	G035201	1.52	0.72	0.23	†	†	†
G6	10	G035401	1.04	2.38	0.25	†	†	†
G6	12	G035601	1.56	1.25	0.25	†	†	†
G6	16	G036001	2.28	1.15	0.27	†	†	†
G7	2	G036201	0.77	0.71	0.00	1.09	-1.09	†
G7	4	G036401	1.29	0.03	0.33	†	†	†
G7	8	G036801	0.80	0.95	0.00	0.12	-0.12	†
G7	13	G037301	1.02	1.57	0.32	†	†	†
G8	7	G012501	1.81	0.96	0.25	†	†	†
G8	8	G012502	1.00	0.51	0.34	†	†	†
G8	9	G012503	0.83	-1.68	0.00	†	†	†
G8	11	G012701	1.12	0.53	0.39	†	†	†
G8	13	G012901	1.08	-0.30	0.22	†	†	†
G8	14	G012902	0.58	-0.75	0.00	†	†	†

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