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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 12 Mathematics National Main Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 12 mathematics national main assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	3	M056001	0.92	-0.81	0.13	†	†	†	†
	11	M056701	1.86	1.47	0.14	†	†	†	†
M4	3	M017601	0.56	-1.89	0.27	†	†	†	†
	7	M018001	1.02	-0.47	0.32	†	†	†	†
	17	M019001	0.83	-0.29	0.13	†	†	†	†
M5	7	M071101	0.54	0.55	0.00	-1.40	1.40	†	†
	9	M071301	1.21	1.42	0.00	0.13	-0.13	†	†
M6	11	M020901	0.63	-0.26	0.00	†	†	†	†
	12	M021001	0.84	-1.03	0.00	†	†	†	†
	17	M021801	1.49	1.31	0.00	†	†	†	†
M8	6	M012731	0.94	0.02	0.15	†	†	†	†
	7	M012831	1.26	-0.90	0.12	†	†	†	†
	17	M011731	1.49	0.21	0.18	†	†	†	†
M9	4	M052601	0.64	0.04	0.19	†	†	†	†
	8	M053301	1.27	1.76	0.00	†	†	†	†
M10	1	M093901	1.21	0.18	0.13	†	†	†	†
	2	M094001	0.76	-0.27	0.19	†	†	†	†
	3	M094101	0.61	2.50	0.25	†	†	†	†
	4	M094201	0.73	0.10	0.00	0.27	0.16	-0.43	†
	5	M094301	1.03	0.83	0.00	0.63	-0.63	†	†
M11	3	M058701	1.16	-0.92	0.17	†	†	†	†
	4	M058901	0.87	0.22	0.00	†	†	†	†
	6	M059101	0.98	0.22	0.32	†	†	†	†
M12	4	M092401	0.84	-0.09	0.00	1.25	-1.25	†	†
	8	M092801	1.35	1.37	0.18	†	†	†	†
M13	8	M095301	0.49	1.09	0.00	-0.75	0.75	†	†
M14	8	M073901	1.56	1.13	0.00	†	†	†	†
M15	7	M076701	1.73	1.38	0.00	0.00	0.00	†	†
	8	M076801	1.03	1.47	0.00	-0.37	0.37	†	†
† 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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