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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for Items in the Geometry and Spatial Sense Scale, Grade 8 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the geometry and spatial sense scale, grade 8 mathematics combined national and state main assessment, by item and block: 2007

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models. 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 represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Mathematics Assessment.
M3	3	M150001	1.04	1.07	0.46	†	†	†	†
	6	M150301	1.35	0.43	0.11	†	†	†	†
M4	1	M151301	0.85	-0.53	0.11	†	†	†	†
	3	M151501	0.71	-0.32	†	0.31	-0.31	†	†
M5	1	M085701	0.43	-0.70	†	†	†	†	†
	2	M085901	0.51	-0.25	†	1.21	-1.21	†	†
	5	M085801	0.76	-0.05	0.22	†	†	†	†
	15	M019601	0.90	1.02	0.17	†	†	†	†
M6	3	M140601	0.72	-1.16	0.24	†	†	†	†
	9	M141201	0.69	0.83	0.15	†	†	†	†
	11	M141401	0.57	0.90	0.16	†	†	†	†
	14	M141701	0.89	1.28	0.11	†	†	†	†
M7	4	M143901	0.79	0.16	0.14	†	†	†	†
	6	M144101	0.65	1.15	0.35	†	†	†	†
	11	M144601	0.76	0.94	†	0.56	-0.56	†	†
	16	M145101	0.22	5.24	†	†	†	†	†
M8	7	M021001	0.81	-0.47	†	†	†	†	†
	9	M020901	0.66	-0.45	†	†	†	†	†
	11	M092401	0.71	0.80	†	1.99	-1.99	†	†
M9	13	M075801	0.66	0.85	†	-0.10	0.10	†	†
	16	M051801	1.55	1.44	0.26	†	†	†	†
	17	M093401	0.93	0.84	0.19	†	†	†	†
M10	3	M142201	0.77	-0.49	0.11	†	†	†	†
	15	M143401	0.97	0.72	0.22	†	†	†	†
	16	M143501	0.43	0.90	†	2.02	-1.19	-1.80	0.96
M11	4	M106001	0.81	0.99	0.22	†	†	†	†
	8	M106401	0.65	1.38	0.23	†	†	†	†
	13	M106901	0.60	1.16	†	†	†	†	†
M12	1	M152701	1.27	-0.26	0.19	†	†	†	†
	4	M153001	0.87	-0.50	0.20	†	†	†	†
	8	M153401	0.85	1.25	0.18	†	†	†	†
	14	M154001	0.79	0.49	0.09	†	†	†	†

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