NAEP Analysis and Scaling - IRT Parameters for Items in the Data Analysis, Statistics, and Probability Scale, Grade 8 Mathematics Combined National and State Main Assessment, by Item and Block: 2009

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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 Data Analysis, Statistics, and Probability Scale, Grade 8 Mathematics Combined National and State Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the data analysis, statistics, and probability scale, grade 8 mathematics combined national and state main assessment, by item and block: 2009
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3
† 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), 2009 Mathematics Assessment.
M3	2	M149901	0.62	0.05	†	0.80	-0.80	†
	7	M150401	0.71	-0.28	0.24	†	†	†
	10	M150701	0.91	0.19	0.12	†	†	†
M4	6	M151801	0.54	-1.32	0.13	†	†	†
M4	11	M152301	0.34	2.14	0.11	†	†	†
M5	9	M047001	0.88	-0.98	0.11	†	†	†
M5	18	M053101	0.61	1.35	†	0.27	0.15	-0.42
M6	4	M140701	0.63	-0.11	0.13	†	†	†
M6	13	M141601	0.95	0.65	†	†	†	†
M7	3	M166001	0.61	-0.82	0.09	†	†	†
M7	14	M167001	0.43	3.21	†	†	†	†
M8	4	M170401	0.50	-0.34	0.18	†	†	†
M8	6	M164601	0.54	0.76	†	-4.22	4.22	†
M9	5	M168901	1.02	-0.02	†	†	†	†
M9	6	M125301	0.61	-0.40	0.11	†	†	†
M10	10	M142901	1.00	0.60	0.14	†	†	†
M10	11	M143001	0.48	-0.22	0.10	†	†	†
M11	8	M171101	1.46	0.24	0.12	†	†	†
	11	M162901	0.67	-0.14	†	0.96	-0.96	†
	15	M167901	0.52	1.47	†	-1.73	1.73	†
M12	6	M153201Z	0.37	-1.28	†	-1.19	1.19	†
M12	16	M154201	0.45	2.52	0.17	†	†	†

Last updated 03 June 2016 (GF)

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