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 Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the geometry scale, grade 4 mathematics combined national and state main assessment, by item and block: 2009

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), 2009 Mathematics Assessment.
M3	2	M145301	0.93	-1.26	0.15	†	†	†	†
	4	M145501	0.62	1.32	0.21	†	†	†	†
	5	M145601	0.47	-1.89	0.16	†	†	†	†
M4	1	M146701	0.76	-1.43	0.14	†	†	†	†
	3	M146901	0.41	0.16	†	-0.55	0.55	†	†
	4	M147001	0.45	0.25	†	0.02	-0.02	†	†
M5	1	M085201	0.66	-1.11	0.21	†	†	†	†
	2	M085301	0.79	-0.55	0.26	†	†	†	†
	3	M085701	0.60	-0.55	†	0.71	-0.71	†	†
	4	M085901	0.45	1.95	†	†	†	†	†
M6	2	M135701	0.58	-2.91	0.19	†	†	†	†
M7	6	M158601	0.69	0.19	0.19	†	†	†	†
	10	M156801	0.52	0.67	0.17	†	†	†	†
M8	2	N214331	0.73	-2.87	0.18	†	†	†	†
	12	M039801	0.88	1.58	0.36	†	†	†	†
M9	3	M161701	0.61	-1.27	0.13	†	†	†	†
	10	M155301	0.59	-0.72	0.18	†	†	†	†
	13	M154701	1.04	0.84	0.28	†	†	†	†
M10	10	M138101	0.44	-0.64	0.15	†	†	†	†
	16	M138701	0.32	0.09	†	0.75	-4.02	1.88	1.40
M11	4	M156101	0.48	0.90	†	-0.04	0.04	†	†
	13	M157501	0.65	-0.34	†	0.74	-0.74	†	†
M12	9	M149001	0.49	1.21	0.19	†	†	†	†
	14	M149501	1.22	1.52	0.18	†	†	†	†
	16	M149701	0.39	-0.35	†	1.60	1.43	-1.00	-2.03

Printer-friendly Version