NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Mathematics Assessments → IRT Parameters for Items in the Geometry Scale, Grade 4 Mathematics Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters in the geometry scale, grade 4 mathematics combined national and state assessments, by item and block: 2011

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
† Not applicable; c parameters are not estimated for 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 exactly zero 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), 2011 Mathematics Assessment.
MC	2	M145301	1.05	-1.24	0.19	†	†	†	†
	4	M145501	0.70	1.33	0.25	†	†	†	†
	5	M145601	0.47	-1.83	0.17	†	†	†	†
MD	1	M146701	0.77	-1.43	0.14	†	†	†	†
	3	M146901	0.42	0.12	†	-0.57	0.57	†	†
	4	M147001	0.46	0.25	†	†	†	†	†
ME	11	M219201	0.73	-1.37	0.18	†	†	†	†
	15	M219601	0.34	-1.16	0.18	†	†	†	†
MF	2	M135701	0.61	-2.95	0.17	†	†	†	†
MG	6	M158601	0.73	0.09	0.18	†	†	†	†
	10	M156801	0.47	0.41	0.12	†	†	†	†
MH	2	N214331	0.69	-3.01	0.17	†	†	†	†
	12	M039801	0.80	1.63	0.36	†	†	†	†
MI	3	M161701	0.61	-1.38	0.08	†	†	†	†
	10	M155301	0.56	-0.93	0.11	†	†	†	†
	13	M154701	1.05	0.74	0.27	†	†	†	†
MJ	2	M219801	0.76	-1.37	0.17	†	†	†	†
	5	M220101	0.82	0.20	0.11	†	†	†	†
MK	4	M156101	0.48	0.81	†	-0.05	0.05	†	†
	13	M157501	0.64	-0.39	†	0.74	-0.74	†	†
ML	9	M149001	0.50	1.09	0.19	†	†	†	†
	14	M149501	1.15	1.50	0.19	†	†	†	†
	16	M149701	0.39	-0.38	†	1.61	1.41	-0.97	-2.05

Printer-friendly Version