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

NAEP Technical DocumentationIRT parameters for the spatial dynamics and connections scale, by block and item, grade 4 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	3	G028001	1.27	0.53	0.13	†	†	†
G3	4	G028101	1.08	-0.48	0.27	†	†	†
G3	5	G028201	0.40	0.44	†	0.05	0.54	-0.59
G3	6	G028301	1.04	0.34	0.20	†	†	†
G3	8	G028501	0.56	0.66	†	†	†	†
G3	9	G028601	1.05	1.38	0.38	†	†	†
G3	12	G028901	1.07	0.32	0.19	†	†	†
G3	13	G029001	1.12	0.89	0.20	†	†	†
G4	9	G008503	0.80	0.17	†	0.55	-0.55	†
G5	5	G009301	1.15	0.44	0.27	†	†	†
G5	7	G009402	0.49	1.23	†	†	†	†
G5	8	G009403	0.89	-1.62	†	†	†	†
G5	9	G009501	0.56	-0.06	0.24	†	†	†
G5	10	G009502	1.71	0.61	0.24	†	†	†
G5	14	G010001	1.66	0.51	0.27	†	†	†
G6	3	G029901	0.49	-0.04	0.31	†	†	†
G6	4	G030001	0.89	0.93	0.26	†	†	†
G6	6	G030201	1.27	0.68	0.21	†	†	†
G6	7	G030301	0.73	0.88	0.20	†	†	†
G6	8	G030401	0.63	0.27	0.24	†	†	†
G6	13	G031201	0.97	0.20	0.19	†	†	†
G6	15	G031401	0.54	0.46	†	0.91	-0.27	-0.64
G8	7	G012501	0.94	3.23	0.21	†	†	†
G8	8	G012502	1.18	1.35	0.22	†	†	†
G8	9	G012503	1.11	-0.15	†	†	†	†
G8	11	G012701	0.70	2.47	0.30	†	†	†
G8	13	G012901	1.04	0.95	0.20	†	†	†
G8	14	G012902	0.49	0.57	†	†	†	†

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