NAEP Analysis and Scaling - IRT Parameters for Items in the Measurement Scale, Grade 8 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 Measurement Scale, Grade 8 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the measurement scale, grade 8 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
† 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	1	M149801	0.45	-1.63	0.17	†	†
	4	M150101	0.80	-0.69	0.16	†	†
	12	M150901	0.88	0.59	†	†	†
	13	M151001	0.97	0.43	0.24	†	†
M4	2	M151401	0.77	0.91	0.05	†	†
	4	M151601	0.93	1.50	†	-0.42	0.42
	12	M152401	0.98	0.89	0.06	†	†
M5	3	M085601	1.05	-0.34	0.25	†	†
	4	M085501	1.07	0.52	0.17	†	†
	12	M047101	0.99	0.09	0.15	†	†
	17	M047901	1.13	1.33	†	†	†
M6	1	M140401	1.10	-0.68	0.11	†	†
	5	M140801	1.34	0.59	0.20	†	†
	7	M141001	1.24	0.00	0.16	†	†
M7	10	M144501	1.08	1.85	0.30	†	†
M7	12	M144701	0.96	0.85	0.29	†	†
M8	2	M013331	1.01	-1.46	0.16	†	†
	6	M073301	0.68	0.93	0.22	†	†
	12	M019201	1.30	1.47	0.15	†	†
M9	5	M072801	0.64	0.06	0.38	†	†
M10	2	M142101	0.82	-0.36	0.20	†	†
	6	M142501	1.26	1.56	0.11	†	†
	12	M143101	0.66	0.23	0.10	†	†
M11	7	M106301	1.10	0.05	†	†	†
	12	M106801	0.61	-1.17	0.09	†	†
	17	M107401	1.39	2.02	0.14	†	†
M12	2	M152801	0.62	0.02	0.12	†	†
M12	11	M153701	1.09	0.31	0.03	†	†

Last updated 08 January 2010 (JL)

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