NAEP Analysis and Scaling - IRT Parameters for Items in the Algebra Scale, Grade 4 MathematicsCombined 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 Algebra Scale, Grade 4 Mathematics Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters for the algebra scale, grade 4 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	11	M146201	1.27	1.14	0.17	†	†	†	†
MC	15	M146601	0.38	0.27	†	-0.42	1.04	-0.45	-0.17
MD	2	M146801	0.49	-0.72	†	†	†	†	†
ME	8	M218901	0.53	-2.80	†	†	†	†	†
ME	12	M219301	0.69	0.83	0.30	†	†	†	†
MF	4	M135901	0.69	-0.95	0.14	†	†	†	†
	10	M136501	0.93	-0.33	†	†	†	†	†
	16	M137101	1.04	1.51	0.17	†	†	†	†
MG	5	M160201	1.24	0.28	0.19	†	†	†	†
	8	M157001	0.47	-1.13	†	0.61	-0.61	†	†
	15	M159401	0.74	1.01	†	-0.40	-0.17	0.57	†
MH	14	M087201	1.09	1.48	0.24	†	†	†	†
MI	9	M162001	0.60	-0.73	†	0.22	-0.22	†	†
MI	14	M159301	1.73	1.02	0.06	†	†	†	†
MJ	1	M219701	0.88	-1.95	0.10	†	†	†	†
MJ	4	M220001	0.43	-1.98	†	-1.79	1.79	†	†
MK	5	M156601	0.79	0.43	0.18	†	†	†	†
	9	M156201	0.35	-0.37	0.19	†	†	†	†
	16	M1610CL	0.23	1.05	†	-0.70	-1.35	-1.15	3.19
ML	3	M148401	0.57	-2.59	0.13	†	†	†	†
	7	M148801	1.29	0.57	0.17	†	†	†	†
	15	M149601	1.62	1.50	0.28	†	†	†	†

Last updated 30 June 2014 (GF)

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