NAEP Analysis and Scaling - IRT Parameters for the Geometry and Spatial Sense Scale, by Block and Item, Grade 8 Mathematics Combined National and State Main Assessment: 2003

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment Item Response Theory Parameters → Mathematics Assessment Item Response Theory Parameters → IRT Parameters for the Geometry and Spatial Sense Scale, by Block and Item, Grade 8 Mathematics Combined National and State Main Assessment: 2003

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: 2003
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2
M3	4	M019901	0.70	-2.08	0.00	†	†
	7	M046201	0.92	-0.91	0.18	†	†
	14	M048001	1.12	1.36	0.11	†	†
M4	2	M046101	0.75	-2.14	0.33	†	†
	4	M046701	0.96	-0.25	0.24	†	†
	12	M068003	0.55	-0.46	†	-2.06	2.06
	13	M068005	0.49	-0.51	†	-1.57	1.57
	15	M068007	0.55	-0.05	0.04	†	†
	16	M068006	0.41	0.69	†	-1.47	1.47
M5	1	M085701	0.43	-0.62	0.00	†	†
	2	M085901	0.52	-0.28	†	1.23	-1.23
	5	M085801	0.70	0.13	0.23	†	†
	15	M019601	0.92	1.14	0.18	†	†
M6	5	M017601	0.40	-2.04	0.19	†	†
	14	M018001	0.66	-0.51	0.20	†	†
	15	M046401	1.06	-1.35	0.13	†	†
	21	M019801	1.10	-1.02	0.00	†	†
	23	M012731	0.34	0.79	0.06	†	†
M7	3	M012831	1.21	0.26	0.17	†	†
	7	M052601	0.50	0.59	0.11	†	†
	10	M019001	0.76	0.57	0.17	†	†
M8	7	M021001	0.83	-0.31	0.00	†	†
	9	M020901	0.65	-0.35	0.00	†	†
	11	M092401	0.62	1.20	†	2.05	-2.05
M9	13	M075801	0.79	0.86	†	0.18	-0.18
	16	M051801	0.96	1.60	0.24	†	†
	17	M093401	0.87	0.89	0.18	†	†
M10	7	M0213CL	0.64	-0.49	†	-0.19	0.19
	9	M052001	0.78	1.16	0.13	†	†
	16	M068201	0.48	0.67	†	†	†
M11	4	M106001	0.69	1.16	0.17	†	†
	8	M106401	0.64	1.53	0.24	†	†
	13	M106901	0.64	0.98	0.00	†	†
M12	4	M110201	0.56	-1.36	0.00	†	†
	9	M110701	0.53	1.20	0.13	†	†
	16	M111501	0.60	-2.10	0.15	†	†
† Not applicable; c parameters are not estimated for generalized partial credit 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 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), 2003 Mathematics Assessment.

Last updated 16 February 2009 (GF)

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