NAEP tdw - IRT Parameters for Items in the Number Properties and Operations Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2013

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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 Number Properties and Operations Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2013

NAEP Technical DocumentationIRT parameters for items in the number properties and operations subscale, grade 4 mathematics combined national and state assessment, by item and block: 2013
Block	Item	NAEP ID	a_j	b_j	c_j	d_j₁	d_j₂	d_j₃	d_j₄
† Not applicable; c parameters are not estimated for the two-parameter logistics 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), 2013 Mathematics Assessment.
MC	1	M145201	0.84	-0.68	.21	†	†	†	†
	3	M145401	0.84	-0.39	.16	†	†	†	†
	7	M145801	0.93	-0.14	.17	†	†	†	†
	9	M146001	0.54	1.03	.31	†	†	†	†
	12	M146301	0.62	0.48	†	-1.65	1.65	†	†
MD	6	M147201	0.46	-1.84	.23	†	†	†	†
	8	M147401	0.74	-1.12	.06	†	†	†	†
	9	M147501	1.01	-0.65	.18	†	†	†	†
	11	M147701	1.38	1.04	.16	†	†	†	†
	13	M147901	1.22	0.59	.14	†	†	†	†
	14	M148001	2.02	1.55	.17	†	†	†	†
	15	M148101	0.47	1.79	†	-0.09	0.09	†	†
ME	1	M218501	1.69	0.64	.07	†	†	†	†
	2	M218502	1.61	0.74	†	†	†	†	†
	3	M218503	2.20	0.30	.14	†	†	†	†
	4	M2185CL	0.71	1.43	†	1.13	-1.45	0.32	†
	10	M219101	0.74	-0.03	.24	†	†	†	†
	14	M219501	0.52	-0.09	†	-0.02	0.02	†	†
MF	3	M135801	0.75	-0.62	.39	†	†	†	†
	5	M136001	0.62	-1.43	.17	†	†	†	†
	6	M136101	1.21	0.93	.18	†	†	†	†
	7	M136201	0.68	-0.82	.13	†	†	†	†
	9	M136401	1.12	-0.04	.14	†	†	†	†
	12	M136701	0.67	1.15	.13	†	†	†	†
MG	3	M156701	0.78	-0.01	†	†	†	†	†
	4	M157101	0.80	0.56	.19	†	†	†	†
	7	M157301	0.82	0.64	†	†	†	†	†
	11	M160701	0.47	-0.07	†	-2.04	2.04	†	†
	12	M160001	0.40	0.13	.06	†	†	†	†
	13	M162401	0.54	0.69	†	-0.43	0.43	†	†
MH	1	M240101	1.01	-0.47	.29	†	†	†	†
	4	M229901	0.80	-1.00	.25	†	†	†	†
	8	M230801	1.26	-0.49	.20	†	†	†	†
	9	M240801	0.98	-0.25	†	†	†	†	†
	12	M240901	0.88	-0.17	.15	†	†	†	†
	14	M241401	0.63	-0.25	.09	†	†	†	†
MI	2	M225401	0.77	-0.42	.16	†	†	†	†
	5	M228601	0.66	-0.85	.25	†	†	†	†
	7	M225101	0.97	0.61	.16	†	†	†	†
	8	M229301	1.82	0.42	.20	†	†	†	†
	11	M338601	0.91	-0.03	.16	†	†	†	†
	14	M338801	1.26	1.55	†	†	†	†	†
	15	M338901	1.23	0.44	.27	†	†	†	†
MJ	6	M220201	0.42	-1.98	.18	†	†	†	†
	9	M220501	0.88	1.05	.33	†	†	†	†
	11	M220701	0.33	-0.76	†	-4.18	4.18	†	†
	12	M220801	1.33	1.32	.06	†	†	†	†
	13	M220901	1.78	1.21	.26	†	†	†	†
	14	M221001	0.80	-0.05	.27	†	†	†	†
MK	1	M158001	1.09	0.26	.30	†	†	†	†
	3	M161101	0.99	-0.81	.16	†	†	†	†
	6	M161601	0.47	-0.30	†	0.33	-0.33	†	†
	8	M159701	0.64	-1.93	.10	†	†	†	†
	10	M155201	0.58	-1.34	.14	†	†	†	†
	15	M162201	0.85	1.80	†	-0.48	0.48	†	†
ML	1	M223901	0.80	-1.65	.18	†	†	†	†
	2	M339001	0.58	-1.65	.13	†	†	†	†
	9	M224801	0.77	-1.20	.09	†	†	†	†
	11	M339301	1.10	0.42	.18	†	†	†	†
	13	M228501	1.06	0.54	.19	†	†	†	†

Last updated 21 May 2017 (DC)

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