NAEP Analysis and Scaling - IRT Parameters for Items in the Measurement Scale, Grade 8 Mathematics Combined National and State Assessments, by Item and Block: 2011

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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 Measurement Scale, Grade 8 Mathematics Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters in the measurement scale, grade 8 mathematics combined national and state assessments, by item and block: 2011
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 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 exactly zero 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), 2011 Mathematics Assessment.
MC	1	M149801	0.48	-1.78	0.14	†	†	†	†
	4	M150101	0.95	-0.29	0.40	†	†	†	†
	12	M150901	0.86	0.56	†	†	†	†	†
	13	M151001	0.86	0.29	0.21	†	†	†	†
MD	2	M151401	0.91	0.93	0.08	†	†	†	†
	4	M151601	0.85	1.45	†	-0.65	0.65	†	†
	12	M152401	0.97	0.69	0.06	†	†	†	†
ME	1	M221201	1.17	0.20	0.35	†	†	†	†
	2	M221202	1.49	0.49	0.35	†	†	†	†
	4	M221204	0.65	0.92	†	1.36	-1.36	†	†
MF	1	M140401	1.14	-0.74	0.11	†	†	†	†
	5	M140801	1.51	0.52	0.20	†	†	†	†
	7	M141001	1.19	-0.09	0.14	†	†	†	†
MG	1	M163801	0.63	-2.68	0.20	†	†	†	†
	5	M164401	1.23	-0.88	0.07	†	†	†	†
	9	M168701	0.54	-0.07	†	-0.84	0.84	†	†
MH	7	M165101	0.93	1.13	0.16	†	†	†	†
MH	10	M120901	0.92	0.65	0.04	†	†	†	†
MI	9	M166801	0.54	0.74	0.08	†	†	†	†
MI	15	M1657CL	0.50	0.97	†	-0.86	3.03	-4.12	1.95
MJ	2	M222501	0.84	0.02	0.19	†	†	†	†
MJ	9	M223201	1.11	1.73	0.30	†	†	†	†
MK	5	M121801	0.74	0.44	0.54	†	†	†	†
MK	13	M167301	1.40	0.93	0.17	†	†	†	†
ML	2	M152801	0.62	0.02	0.13	†	†	†	†
ML	11	M153701	1.12	0.21	0.03	†	†	†	†

Last updated 30 June 2014 (GF)

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