NAEP tdw - IRT Parameters for Items in the Number Properties and Operations Subscale, Grade 8 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 8 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 8 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 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), 2013 Mathematics Assessment.
MC	5	M150201	0.88	0.66	.14	†	†	†	†
MD	8	M152001	1.23	0.86	.08	†	†	†	†
ME	6	M221401	0.87	1.26	.19	†	†	†	†
	9	M221701	0.38	-0.18	†	†	†	†	†
	15	M222301	0.64	0.51	†	1.27	-1.27	†	†
MF	8	M141101	0.79	-1.00	.05	†	†	†	†
	10	M141301	0.57	0.79	†	-1.14	1.14	†	†
	15	M141801	1.02	0.78	.18	†	†	†	†
MG	2	M120701	0.57	-1.98	.12	†	†	†	†
	8	M166101	1.53	1.37	.18	†	†	†	†
	13	M164801	0.96	0.79	.23	†	†	†	†
	16	M1685CL	0.69	1.46	†	0.76	0.54	-0.66	-0.64
MH	4	M234501	1.45	-0.57	.08	†	†	†	†
	7	M236001	1.33	-0.01	.14	†	†	†	†
	13	M237801	1.04	-0.13	.18	†	†	†	†
MI	1	M238701	1.18	-0.27	.17	†	†	†	†
	6	M236601	1.31	-0.44	.29	†	†	†	†
	10	M238101	1.03	0.20	.32	†	†	†	†
	12	M234702	0.97	-0.02	†	0.04	-0.04	†	†
MJ	1	M222401	0.65	-1.66	.07	†	†	†	†
	7	M223001	0.89	-0.17	.04	†	†	†	†
	12	M223501	0.71	-0.42	.30	†	†	†	†
MK	1	M163101	0.77	-0.45	†	0.63	-0.63	†	†
	3	M122701	0.50	-0.30	.11	†	†	†	†
	4	M119601	0.49	-0.47	.04	†	†	†	†
	7	M169201	1.24	-0.23	.24	†	†	†	†
ML	1	M232901	0.87	-2.26	.15	†	†	†	†
	5	M233501	0.82	-0.07	†	†	†	†	†
	9	M231901	1.77	0.47	.22	†	†	†	†

Last updated 21 May 2017 (DC)

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