NAEP Analysis and Scaling - IRT Parameters for Items in the Geometry and Spatial Sense Scale, by Block and Item, Grade 8 Mathematics National Main Assessment: 2005

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Mathematics Assessment Item Response Theory Parameters → IRT Parameters for Items in the Geometry and Spatial Sense Scale, by Block and Item, Grade 8 Mathematics Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the geometry and spatial sense scale, by block and item, grade 8 mathematics combined national and state main assessment: 2005
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. # Rounds to zero. 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 is 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), 2005 Mathematics Assessment.
M3	4	M019901	0.68	-2.07	0.00	†	†	†	†
	7	M046201	0.95	-1.07	0.12	†	†	†	†
	14	M048001	1.32	1.37	0.14	†	†	†	†
M4	2	M046101	0.67	-2.59	0.16	†	†	†	†
	4	M046701	0.99	-0.33	0.22	†	†	†	†
	12	M068003	0.57	-0.44	†	-1.98	1.98	†	†
	13	M068005	0.49	-0.49	†	-1.62	1.62	†	†
	15	M068007	0.53	-0.11	0.03	†	†	†	†
	16	M068006	0.40	0.70	†	-1.31	1.31	†	†
M5	1	M085701	0.43	-0.71	0.00	†	†	†	†
	2	M085901	0.54	-0.28	†	1.21	-1.21	†	†
	5	M085801	0.79	0.15	0.25	†	†	†	†
	15	M019601	0.90	1.09	0.17	†	†	†	†
M6	3	M140601	0.66	-1.30	0.16	†	†	†	†
	9	M141201	0.65	0.85	0.12	†	†	†	†
	11	M141401	0.57	1.01	0.17	†	†	†	†
	14	M141701	0.95	1.43	0.13	†	†	†	†
M7	4	M143901	0.78	0.23	0.14	†	†	†	†
	6	M144101	0.53	1.27	0.31	†	†	†	†
	11	M144601	0.76	0.99	†	0.60	-0.60	†	†
	16	M145101	0.22	5.22	0.00	†	†	†	†
M8	7	M021001	0.83	-0.38	0.00	†	†	†	†
	9	M020901	0.67	-0.35	0.00	†	†	†	†
	11	M092401	0.63	1.06	†	2.04	-2.04	†	†
M9	13	M075801	0.70	0.86	†	#	#	†	†
	16	M051801	1.50	1.47	0.26	†	†	†	†
	17	M093401	0.98	0.85	0.20	†	†	†	†
M10	3	M142201	0.76	-0.39	0.12	†	†	†	†
	15	M143401	1.00	0.70	0.21	†	†	†	†
	16	M143501	0.41	0.89	†	2.03	-1.36	-1.67	0.99
M11	4	M106001	0.77	1.06	0.19	†	†	†	†
	8	M106401	0.63	1.46	0.24	†	†	†	†
	13	M106901	0.60	1.05	0.00	†	†	†	†
M12	4	M110201	0.54	-1.46	0.00	†	†	†	†
	9	M110701	0.65	1.20	0.17	†	†	†	†
	15	M111401	0.94	0.62	0.21	†	†	†	†
	16	M111501	0.59	-2.08	0.16	†	†	†	†

Last updated 27 July 2009 (JL)

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