NAEP Analysis and Scaling - IRT Parameters for Items in the Data Analysis, Statistics, and Probability Scale, Grade 4 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

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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 Data Analysis, Statistics, and Probability Scale, Grade 4 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the data analysis, statistics, and probability scale, grade 4 mathematics combined national and state main assessment, by item and block: 2007
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), 2007 Mathematics Assessment.
M4	7	M147301	0.71	-1.08	0.32	†	†	†	†
	10	M147601	0.58	0.90	0.15	†	†	†	†
	12	M147801	1.30	0.47	0.11	†	†	†	†
M5	10	M047001	1.53	0.89	0.20	†	†	†	†
M6	14	M136901	0.67	0.35	†	-0.07	0.07	†	†
M6	15	M137001	0.80	1.00	0.25	†	†	†	†
M7	7	M139401	0.73	0.60	0.13	†	†	†	†
M8	6	M072301	0.53	-1.49	0.12	†	†	†	†
M8	13	M040001	0.87	-0.17	†	†	†	†	†
M9	3	M043201	0.54	-1.61	†	†	†	†	†
	10	M043101	1.37	0.05	0.27	†	†	†	†
	20	M091401	0.40	1.28	†	-2.76	2.88	0.22	-0.34
M10	4	M137501	1.11	-0.95	†	†	†	†	†
M10	5	M137601	1.06	0.15	0.34	†	†	†	†
M11	4	M096001	0.80	0.43	†	†	†	†	†
	6	M096301	0.93	-1.27	0.21	†	†	†	†
	16	M097401	1.02	-0.27	†	1.43	-1.43	†	†
M12	2	M148301	0.61	-1.37	0.15	†	†	†	†
	4	M148501	0.54	-0.37	†	-0.31	0.31	†	†
	5	M148601	1.00	0.35	0.23	†	†	†	†

Last updated 08 January 2010 (JL)

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