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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 Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2017

NAEP Technical DocumentationIRT Parameters for Items in the Algebra Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2017

IRT parameters for items in the algebra subscale, grade 4 mathematics combined national and state assessment, by item and block: 2017
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
M1	5	M372201	1.32	0.35	0.10	†	†	†	†
M2	6	M3705MS	0.59	-0.32	†	-0.43	0.43	†	†
M2	10	M369901	0.86	1.12	0.21	†	†	†	†
M3	6	M3725MS	0.35	1.26	†	1.43	-1.43	†	†
	14	M3743MS	0.45	1.83	†	†	†	†	†
	15	M3715CL	0.38	2.52	†	1.57	-3.47	1.90	†
M4	7	M342101	0.52	0.55	†	0.02	-0.02	†	†
	14	M345201	1.31	1.04	0.13	†	†	†	†
	16	M344801	1.35	0.16	0.16	†	†	†	†
M5	4	M227601	0.78	-0.56	0.14	†	†	†	†
	12	M226801	1.11	0.62	†	†	†	†	†
	18	M342501	0.94	-0.04	0.17	†	†	†	†
M6	1	M219701	0.97	-1.56	0.16	†	†	†	†
	4	M220001	0.40	-1.48	†	-1.79	1.79	†	†
	19	M219301	0.62	0.53	0.21	†	†	†	†
M7	5	M156601	0.74	0.56	0.13	†	†	†	†
	9	M156201	0.20	1.33	0.17	†	†	†	†
	14	M2311CL	0.82	0.49	†	-0.22	0.44	-0.22	†
M8	5	M3783CL	0.81	-0.71	†	0.53	-0.53	†	†
M8	13	M3757MS	0.84	1.66	†	†	†	†	†
M9	7	M3468CL	0.70	-0.19	†	1.41	-1.41	†	†
	10	M348501	0.93	0.11	0.13	†	†	†	†
	13	M347501	1.58	0.06	0.23	†	†	†	†
	17	M228801	1.18	1.16	0.33	†	†	†	†
M10	5	M229201	0.86	-0.55	0.13	†	†	†	†
M10	13	M240601	0.75	-0.76	†	†	†	†	†
† Not applicable; c parameters are not estimated for the two-parameter logistic model or 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 assumed to be exactly zero and is not estimated 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), 2017 Mathematics Assessment.

Last updated 11 May 2022 (SK)

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