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 Geometry Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2015

NAEP Technical DocumentationIRT Parameters for Items in the Geometry Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2015

IRT parameters for items in the geometry subscale, grade 4 mathematics combined national and state assessment, by item and block: 2015
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
M3	9	M341701	0.85	2.20	0.33	†	†	†	†
M4	1	M146701	0.79	-1.20	0.27	†	†	†	†
	3	M146901	0.40	0.13	†	-0.63	0.63	†	†
	4	M147001	0.51	0.38	†	0.10	-0.10	†	†
M5	11	M219201	0.81	-1.13	0.24	†	†	†	†
M5	15	M219601	0.34	-0.47	0.30	†	†	†	†
M6	1	M228401	0.69	-1.30	0.37	†	†	†	†
	4	M342001	0.89	0.28	0.21	†	†	†	†
	9	M343101	1.72	1.32	0.32	†	†	†	†
M7	8	M348401	0.67	-0.77	0.20	†	†	†	†
M7	11	M347801	0.56	1.41	0.21	†	†	†	†
M8	7	M230901	0.72	-0.20	0.25	†	†	†	†
M8	11	M241001	0.68	0.57	0.12	†	†	†	†
M9	3	M224301	0.33	-2.27	†	-1.84	1.84	†	†
M9	13	M338701	1.09	1.31	0.17	†	†	†	†
M10	2	M219801	0.70	-1.14	0.25	†	†	†	†
M10	5	M220101	1.17	0.47	0.19	†	†	†	†
M11	4	M156101	0.47	0.74	†	-0.03	0.03	†	†
M11	13	M157501	0.64	-0.38	†	0.72	-0.72	†	†
M12	3	M227201	0.44	-0.07	†	-0.74	0.74	†	†
	6	M227701	0.99	-0.12	0.13	†	†	†	†
	12	M339401	0.63	0.44	†	0.22	-0.22	†	†
† 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, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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, d_ji 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), 2015 Mathematics Assessment.

Last updated 17 November 2021 (ML)

Printer-friendly Version