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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 Algebra and Functions Scale, Grade 4 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the algebra and functions scale, grade 4 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	11	M146201	1.39	1.11	0.18	†	†	†	†
	15	M146601	0.44	0.36	†	-0.42	1.05	-0.43	-0.21
M4	2	M146801	0.49	-0.72	†	†	†	†	†
M5	7	M019701	0.58	-0.92	†	†	†	†	†
	12	M066501	0.75	0.28	†	-0.38	0.38	†	†
M6	4	M135901	0.70	-0.94	0.17	†	†	†	†
	10	M136501	0.89	-0.33	†	†	†	†	†
	16	M137101	1.16	1.42	0.16	†	†	†	†
M7	4	M139101	0.57	-1.02	0.29	†	†	†	†
	12	M139901	1.42	1.56	0.11	†	†	†	†
M8	14	M087201	0.82	1.76	0.25	†	†	†	†
M9	5	M086801	0.59	-1.36	0.24	†	†	†	†
	17	M074401	0.83	0.78	0.22	†	†	†	†
M10	2	M137301	0.92	-0.97	0.29	†	†	†	†
	8	M137901	0.60	-0.69	0.18	†	†	†	†
	13	M138401	0.66	0.64	†	0.65	-0.65	†	†
M11	3	M095901	1.06	0.46	0.27	†	†	†	†
M12	3	M148401	0.53	-2.47	0.23	†	†	†	†
	7	M148801	1.45	0.56	0.19	†	†	†	†
	15	M149601	1.57	1.50	0.27	†	†	†	†

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