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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 State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the geometry and spatial sense scale, by block and item, grade 4 mathematics state assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	9	M039801	0.94	1.75	0.36	†	†	†	†
M4	3	M017601	0.34	-0.34	0.35	†	†	†	†
	7	M018001	1.11	1.40	0.23	†	†	†	†
M6	11A	M020701	0.77	0.89	0.00	†	†	†	†
	2A	M019801	0.82	1.50	0.00	†	†	†	†
	3A	M019901	0.61	-0.82	0.00	†	†	†	†
M7	7A	M068003	1.06	0.95	0.00	†	†	†	†
	8A	M068004	0.23	1.59	0.00	-1.16	1.61	-0.64	0.19
M8	15A	M011231	1.47	1.87	0.26	†	†	†	†
	1A	N214331	0.87	-1.94	0.27	†	†	†	†
M10	1	M085201	0.74	-0.63	0.20	†	†	†	†
	4	M085301	0.83	-0.09	0.22	†	†	†	†
	3A	M085701	0.59	-0.20	0.00	0.64	-0.64	†	†
	5A	M085901	0.49	2.13	0.00	†	†	†	†
	6A	M085401	0.68	1.44	0.00	0.79	-0.25	0.38	-0.91
M11	2	M046101	0.82	-0.84	0.29	†	†	†	†
	3	M046201	1.09	0.55	0.20	†	†	†	†
	5	M046401	0.92	0.33	0.22	†	†	†	†
	8	M046701	0.63	1.23	0.17	†	†	†	†
	15	M047401	0.79	-2.00	0.22	†	†	†	†
M13	9,10,11	M0434CL	0.71	1.14	0.00	0.31	0.79	-1.10	†
M15	4A	M074501	0.60	0.52	0.00	0.76	-0.76	†	†
	8A	M074901	0.69	0.89	0.00	0.06	-0.06	†	†
† 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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