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

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

IRT parameters for items in the geometry 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	1	M3833MS	0.25	-1.70	†	1.52	-1.52	†	†
	9	M384901	1.44	1.12	0.27	†	†	†	†
	14	M3832MS	0.76	2.71	†	†	†	†	†
M2	5	M3809MS	0.62	-1.30	†	†	†	†	†
	9	M3846MS	0.46	0.81	†	-0.53	0.53	†	†
	13	M3800MS	0.56	1.82	†	-0.28	0.28	†	†
M3	8	M385701	0.47	1.19	0.10	†	†	†	†
	10	M3821MS	0.64	1.08	†	0.36	-0.36	†	†
	12	M3814MS	0.64	1.82	†	-0.42	0.42	†	†
	15	M381802	0.99	1.46	†	-0.63	0.63	†	†
M4	9	M352401	0.76	0.55	0.13	†	†	†	†
M4	11	M355801	0.82	1.05	0.08	†	†	†	†
M5	4	D2227MS	0.94	0.07	†	†	†	†	†
	14	M223701	1.85	1.51	0.16	†	†	†	†
	17	M221501	0.81	-1.12	0.16	†	†	†	†
M6	2	M170901	1.25	0.08	0.26	†	†	†	†
	10	M169101	0.68	2.10	0.30	†	†	†	†
	18	M171201	1.15	1.37	0.20	†	†	†	†
M7	3	M339501	1.37	-0.01	0.23	†	†	†	†
M7	4	M232001	0.71	0.64	0.11	†	†	†	†
M8	7	M3887MS	0.48	1.04	†	-0.71	0.71	†	†
	10	M388201	0.48	1.24	†	-4.50	4.50	†	†
	13	M3873CL	0.72	1.67	†	-0.01	0.02	-0.01	†
M9	2	M238801	0.90	-0.20	0.21	†	†	†	†
	6	M356101	0.45	1.27	0.09	†	†	†	†
	9	M356401	0.55	1.71	†	†	†	†	†
M10	2	M235901	1.45	0.74	0.14	†	†	†	†
	4	M237101	1.47	1.15	0.23	†	†	†	†
	9	M238301	0.77	0.46	0.06	†	†	†	†
† 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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