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 Number Sense, Properties, and Operations Scale, Grade 4 Mathematics Combined National and State Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the number sense, properties, and operations 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	1	M145201	0.92	-0.36	0.27	†	†	†	†
	3	M145401	0.83	-0.31	0.16	†	†	†	†
	7	M145801	1.02	0.08	0.20	†	†	†	†
	9	M146001	0.63	1.62	0.33	†	†	†	†
	12	M146301	0.65	0.60	†	-1.67	1.67	†	†
M4	6	M147201	0.49	-1.24	0.39	†	†	†	†
	8	M147401	0.71	-1.08	0.06	†	†	†	†
	9	M147501	1.07	-0.53	0.23	†	†	†	†
	11	M147701	1.45	1.00	0.17	†	†	†	†
	13	M147901	1.33	0.66	0.15	†	†	†	†
	14	M148001	2.01	1.60	0.17	†	†	†	†
	15	M148101	0.49	1.81	†	-0.14	0.14	†	†
M5	6	M085401	0.71	0.72	†	0.44	-0.67	0.23	†
	8	M020001	0.92	-0.66	†	†	†	†	†
	9	M046301	1.07	0.44	0.21	†	†	†	†
	11	M046501	1.13	1.05	0.43	†	†	†	†
	14	M066301	0.40	-0.41	†	-2.17	2.17	†	†
	15	M067901	0.70	0.15	†	-1.16	1.16	†	†
M6	3	M135801	0.92	-0.21	0.49	†	†	†	†
	5	M136001	0.66	-0.91	0.26	†	†	†	†
	6	M136101	1.42	0.96	0.20	†	†	†	†
	7	M136201	0.67	-0.83	0.11	†	†	†	†
	9	M136401	1.11	0.04	0.15	†	†	†	†
	12	M136701	0.73	1.19	0.15	†	†	†	†
M7	3	M156701	0.81	0.11	†	†	†	†	†
	4	M157101	0.95	0.75	0.23	†	†	†	†
	7	M157301	0.86	0.58	†	†	†	†	†
	11	M160701	0.47	0.01	†	-1.92	1.92	†	†
	12	M160001	0.40	0.23	0.08	†	†	†	†
	13	M162401	0.58	0.82	†	-0.44	0.44	†	†
M8	1	M010131	0.34	-2.65	0.20	†	†	†	†
	4	M086701	1.22	-0.60	0.20	†	†	†	†
	5	M010631	0.18	-1.95	†	†	†	†	†
	7	M010831	0.88	0.62	0.26	†	†	†	†
	8	M010331	0.90	-0.25	0.31	†	†	†	†
	11	M087001	0.62	-0.08	†	0.12	-0.12	†	†
	17	M072401	0.64	0.40	†	0.18	-0.18	†	†
	19	M087301	0.65	1.34	†	0.43	-1.28	0.02	0.84
M9	2	M159501	1.03	0.04	0.11	†	†	†	†
	4	M161201	0.49	-1.43	†	-0.36	0.36	†	†
	5	M154401	0.76	-1.20	0.09	†	†	†	†
	8	M155501	0.76	-0.89	0.09	†	†	†	†
	12	M157601	0.65	1.15	†	-0.51	0.51	†	†
	16	M155101	0.55	0.80	†	2.02	-0.86	-0.68	-0.49
M10	1	M137201	0.74	-0.64	0.08	†	†	†	†
	7	M137801	1.11	0.50	0.15	†	†	†	†
	11	M138201	0.72	0.40	†	†	†	†	†
	12	M138301	0.72	0.07	0.17	†	†	†	†
	15	M138601	1.63	0.95	0.05	†	†	†	†
M11	1	M158001	1.04	0.32	0.32	†	†	†	†
	3	M161101	0.96	-0.63	0.17	†	†	†	†
	6	M161601	0.48	-0.29	†	0.30	-0.30	†	†
	8	M159701	0.60	-1.77	0.14	†	†	†	†
	10	M155201	0.71	-0.74	0.35	†	†	†	†
	15	M162201	0.85	1.83	†	-0.52	0.52	†	†
M12	6	M148701	0.83	0.48	0.17	†	†	†	†
	10	M149101	0.83	0.65	0.12	†	†	†	†
	11	M149201	0.52	1.18	†	-1.31	1.31	†	†
	12	M149301	0.79	0.89	†	†	†	†	†
	13	M149401	0.64	0.62	0.14	†	†	†	†

Printer-friendly Version