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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 8 Mathematics Combined National and State Assessment, by Block and Item: 2017

NAEP Technical DocumentationIRT Parameters for Items in the Measurement Subscale, Grade 8 Mathematics Combined National and State Assessment, by Block and Item: 2017

IRT parameters for items in the measurement subscale, grade 8 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	M3797MS	0.32	-0.56	†	-1.74	1.74	†	†
	5	M3853MS	0.52	0.10	†	-1.20	1.20	†	†
	12	M3816CL	0.52	0.85	†	0.81	0.27	-3.62	2.54
M2	2	M383501	0.73	1.19	0.20	†	†	†	†
	7	M382902	0.48	0.41	†	0.48	-0.48	†	†
	14	M3810MS	1.18	0.11	†	†	†	†	†
M3	5	M3838MS	0.57	-1.04	†	0.27	-0.27	†	†
	7	M367501	0.26	4.71	†	†	†	†	†
	9	M3822MS	0.73	-0.74	†	†	†	†	†
M4	2	M3519CL	0.66	-0.03	†	-0.54	0.54	†	†
M4	4	M353001	0.87	0.68	0.33	†	†	†	†
M5	2	M222501	0.96	0.10	0.17	†	†	†	†
	9	M223201	0.77	1.72	0.26	†	†	†	†
	20	M234601	1.09	0.04	0.11	†	†	†	†
M6	5	M121801	0.98	0.76	0.53	†	†	†	†
M6	13	M167301	1.55	0.81	0.19	†	†	†	†
M7	2	M231401	0.99	0.85	0.48	†	†	†	†
	6	M233101	1.04	-0.41	0.23	†	†	†	†
	13	M339601	0.57	0.22	0.13	†	†	†	†
	20	M152401	1.31	0.77	0.08	†	†	†	†
M8	4	M3878MS	1.09	-0.22	†	†	†	†	†
M8	14	M3899MS	0.47	3.87	†	†	†	†	†
M9	1	M354501	1.02	0.71	0.36	†	†	†	†
M9	8	M355401	0.85	1.87	0.13	†	†	†	†
M10	8	M237601	0.95	-0.47	0.25	†	†	†	†
M10	20	M236401	0.95	-0.67	0.25	†	†	†	†
† 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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