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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 Permitted [R3]): 2000

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

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	9	M039801	0.90	1.77	0.36	†	†	†	†
M4	3	M017601	0.25	-0.89	0.29	†	†	†	†
	7	M018001	1.48	1.39	0.26	†	†	†	†
M6	2	M019801	0.79	1.26	0.00	†	†	†	†
	3	M019901	0.59	-0.92	0.00	†	†	†	†
	11	M020701	0.73	0.89	0.00	†	†	†	†
M7	7	M068003	1.20	0.87	0.00	†	†	†	†
	8	M068004	0.24	1.56	0.00	-1.60	2.08	-0.37	-0.12
M8	1	N214331	0.79	-2.11	0.23	†	†	†	†
	15	M011231	1.41	1.85	0.27	†	†	†	†
M10	1	M085201	0.86	-0.57	0.23	†	†	†	†
	3	M085701	0.62	-0.18	0.00	0.58	-0.58	†	†
	4	M085301	0.62	-0.18	0.20	†	†	†	†
	5	M085901	0.53	1.98	0.00	†	†	†	†
	6	M085401	0.65	1.39	0.00	0.69	-0.22	0.44	-0.91
M11	2	M046101	0.77	-0.89	0.30	†	†	†	†
	3	M046201	1.37	0.50	0.22	†	†	†	†
	5	M046401	0.84	0.11	0.18	†	†	†	†
	8	M046701	0.62	1.17	0.16	†	†	†	†
	15	M047401	0.95	-1.85	0.21	†	†	†	†
M13	9	M0434CL	0.71	1.08	0.00	0.33	0.83	-1.16	†
M15	4	M074501	0.57	0.57	0.00	0.70	-0.70	†	†
	8	M074901	0.70	0.77	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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