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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for the Geometry and Spatial Sense Scale, by Block and Item, Grade 4 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 4 mathematics national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	9	M039801	0.68	1.72	0.34	†	†	†	†
M4	3	M017601	0.22	-1.26	0.28	†	†	†	†
	7	M018001	1.67	1.32	0.27	†	†	†	†
M6	2	M019801	0.86	1.25	0.00	†	†	†	†
	3	M019901	0.65	-0.85	0.00	†	†	†	†
	11	M020701	0.67	0.94	0.00	†	†	†	†
M7	7	M068003	1.21	0.86	0.00	†	†	†	†
	8	M068004	0.21	1.63	0.00	-1.87	1.96	-0.17	0.08
M8	1	N214331	0.93	-1.92	0.25	†	†	†	†
	15	M011231	1.66	1.90	0.26	†	†	†	†
M10	1	M085201	0.92	-0.43	0.27	†	†	†	†
	3	M085701	0.62	-0.17	0.00	0.57	-0.57	†	†
	4	M085301	0.64	-0.16	0.20	†	†	†	†
	5	M085901	0.55	1.96	0.00	†	†	†	†
	6	M085401	0.60	1.42	0.00	0.66	-0.22	0.49	-0.93
M11	2	M046101	0.73	-0.95	0.27	†	†	†	†
	3	M046201	1.21	0.39	0.18	†	†	†	†
	5	M046401	0.95	0.19	0.23	†	†	†	†
	8	M046701	0.73	1.15	0.16	†	†	†	†
	15	M047401	0.88	-1.94	0.22	†	†	†	†
M13	9	M0434CL	0.72	1.01	0.00	0.37	0.78	-1.15	†
M15	4	M074501	0.54	0.56	0.00	0.67	-0.67	†	†
	8	M074901	0.70	0.80	0.00	-0.02	0.02	†	†
† 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), 2000 Mathematics Assessment.

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