Table of Contents | Search Technical Documentation | References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for Items in the Data Analysis, Statistics, and Probability Subscale, Grade 4 Mathematics Combined National and State Assessment, by Block and Item: 2017

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

IRT parameters for items in the data analysis, statistics, and probability 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	3	M3688CL	0.95	-0.46	†	0.18	-0.18	†	†
M2	3	M3708MS	0.60	-0.02	†	-0.08	0.08	†	†
M2	14	M374201	1.05	1.61	0.06	†	†	†	†
M3	9	M3730MS	0.49	1.19	†	-1.13	1.13	†	†
M3	12	M369501	1.07	2.11	0.12	†	†	†	†
M4	6	M340301	0.92	0.86	0.23	†	†	†	†
M4	18	M230501	1.70	0.93	0.41	†	†	†	†
M5	6	M231001	0.60	0.28	0.22	†	†	†	†
	10	M225001	0.73	0.65	†	0.48	-0.48	†	†
	15	M147601	0.51	2.17	0.20	†	†	†	†
M6	7	M220301	0.88	-0.04	0.11	†	†	†	†
	10	M220601	0.53	3.09	0.21	†	†	†	†
	17	M147301	0.89	0.35	0.51	†	†	†	†
M7	13	M162301	0.72	0.93	0.10	†	†	†	†
M7	18	M218701	1.18	-0.72	0.14	†	†	†	†
M8	6	M378001	0.69	2.04	0.16	†	†	†	†
M9	3	M346101	0.68	-0.01	†	0.48	-0.48	†	†
	16	M348301	1.38	1.87	†	†	†	†	†
	19	M147801	1.20	0.56	0.07	†	†	†	†
M10	8	D2188MS	0.78	-0.83	†	†	†	†	†
	14	M240301	0.66	-1.91	0.15	†	†	†	†
	18	M344901	1.14	0.90	0.34	†	†	†	†
† 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)

Printer-friendly Version