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

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

IRT parameters for items in the geometry 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	9	M3719MS	0.54	0.46	†	†	†	†	†
	11	M3727MS	0.29	0.98	†	-0.41	0.41	†	†
	14	M3746CL	0.58	2.43	†	-0.37	0.37	†	†
M2	4	M3701MS	0.81	-0.40	†	†	†	†	†
	9	M3691MS	0.53	1.79	†	†	†	†	†
	12	M371001	0.86	1.04	0.09	†	†	†	†
M3	2	M374001	0.46	1.79	0.32	†	†	†	†
M3	10	M3684MS	0.35	1.94	†	-0.53	0.53	†	†
M4	1	M228401	0.93	-0.13	0.52	†	†	†	†
	4	M342001	0.87	0.59	0.23	†	†	†	†
	9	M343101	0.73	1.93	0.27	†	†	†	†
	19	M241001	0.74	0.79	0.14	†	†	†	†
M5	3	M224301	0.38	-1.70	†	-0.99	0.99	†	†
	13	M338701	1.61	1.86	0.15	†	†	†	†
	17	M219601	0.39	0.48	0.33	†	†	†	†
M6	2	M219801	0.82	-0.51	0.29	†	†	†	†
	5	M220101	0.85	1.06	0.16	†	†	†	†
	15	M341701	0.10	7.74	0.19	†	†	†	†
	18	M230901	0.85	0.33	0.28	†	†	†	†
M7	12	D1575MS	0.70	0.02	†	0.53	-0.53	†	†
M7	16	M339401	0.66	0.70	†	0.13	-0.13	†	†
M8	4	M377701	0.49	-1.43	†	†	†	†	†
M8	7	M375501	0.28	1.31	0.29	†	†	†	†
M9	8	M348401	0.72	-0.26	0.26	†	†	†	†
M9	11	M347801	0.50	1.65	0.17	†	†	†	†
M10	3	M227201	0.36	0.54	†	-0.85	0.85	†	†
	6	M227701	1.44	0.09	0.18	†	†	†	†
	17	M219201	1.13	-0.57	0.26	†	†	†	†
† 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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