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

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

IRT parameters for items in the measurement subscale, grade 4 mathematics combined national and state assessment, by block and item: 2017
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
M1	2	M367701	0.41	-0.17	0.16	†	†	†	†
	7	M3706MS	0.69	2.06	†	†	†	†	†
	10	M369401	0.81	1.34	†	0.40	-0.40	†	†
	12	M3729CL	0.44	3.26	†	-1.92	4.48	-2.56	†
M2	1	M373401	0.51	-1.60	0.15	†	†	†	†
	7	M3721MS	0.66	0.30	†	†	†	†	†
	15	M370001	0.64	2.15	†	-0.76	0.76	†	†
M3	1	M3692MS	0.81	-2.06	†	†	†	†	†
	4	M230001	0.55	0.15	0.12	†	†	†	†
	7	M3711CL	0.57	0.17	†	0.85	-2.24	1.39	†
M4	2	M344501	0.58	-1.51	0.18	†	†	†	†
	11	M343801	1.43	0.82	0.20	†	†	†	†
	17	M338501	0.73	-0.27	0.15	†	†	†	†
M5	1	M226901	1.36	1.01	0.38	†	†	†	†
M5	9	M219401	0.79	-1.36	0.17	†	†	†	†
M6	3	M219901	0.48	0.78	0.13	†	†	†	†
M6	14	M221101	1.12	0.43	†	0.14	-0.14	†	†
M7	2	M156301	0.65	-1.56	0.14	†	†	†	†
M7	7	M158301	1.00	1.16	0.23	†	†	†	†
M8	1	M3764MS	0.67	-1.25	†	†	†	†	†
	9	M3756MS	0.55	1.35	†	-1.46	1.46	†	†
	11	M378401	0.33	4.87	†	†	†	†	†
M9	1	M347701	0.50	-1.69	0.13	†	†	†	†
	6	M347401	0.74	-0.59	0.14	†	†	†	†
	9	M347201	0.47	-0.93	0.16	†	†	†	†
	14	M230301	1.28	0.45	†	†	†	†	†
M10	4	M339101	0.64	0.79	0.17	†	†	†	†
	10	M339201	0.92	0.23	0.14	†	†	†	†
	15	M218601	0.84	-1.02	0.14	†	†	†	†
	19	M219001	0.58	-1.17	0.13	†	†	†	†
† 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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