NAEP Analysis and Scaling - IRT Parameters for Items in the Geometry and Spatial Sense Scale, Grade 4 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

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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 4 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 4 mathematics combined national and state main assessment, by item and block: 2007
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
† 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, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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, d_ji 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	2	M145301	0.92	-1.11	0.20	†	†	†	†
	4	M145501	0.63	1.24	0.19	†	†	†	†
	5	M145601	0.44	-1.88	0.20	†	†	†	†
M4	1	M146701	0.85	-1.10	0.27	†	†	†	†
	3	M146901	0.41	0.22	†	-0.55	0.55	†	†
	4	M147001	0.46	0.29	†	†	†	†	†
M5	1	M085201	0.77	-0.90	0.26	†	†	†	†
	2	M085301	0.83	-0.49	0.23	†	†	†	†
	3	M085701	0.60	-0.49	†	0.63	-0.63	†	†
	4	M085901	0.46	1.94	†	†	†	†	†
M6	2	M135701	0.55	-3.02	0.21	†	†	†	†
M7	1	M138801	0.61	-2.44	0.17	†	†	†	†
M7	10	M139701	0.87	-0.04	0.25	†	†	†	†
M8	2	N214331	0.76	-2.91	0.19	†	†	†	†
M8	12	M039801	0.75	1.50	0.33	†	†	†	†
M9	15	M0434CL	0.75	0.78	†	0.34	0.71	-1.05	†
M10	10	M138101	0.47	-0.25	0.18	†	†	†	†
M10	16	M138701	0.34	0.13	†	0.67	-3.79	1.77	1.34
M11	8	M096601	0.65	-2.16	0.14	†	†	†	†
	12	M097001	1.38	1.32	0.29	†	†	†	†
	18	M097601	1.07	0.69	0.37	†	†	†	†
M12	9	M149001	0.54	1.27	0.19	†	†	†	†
	14	M149501	0.92	1.63	0.16	†	†	†	†
	16	M149701	0.39	-0.28	†	1.60	1.38	-1.03	-1.94

Last updated 08 January 2010 (JL)

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