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: 2009

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 4 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 4 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
† 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.
M4	7	M147301	0.67	-1.37	0.18	†	†
	10	M147601	0.52	0.78	0.12	†	†
	12	M147801	1.28	0.38	0.10	†	†
M5	10	M047001	0.94	0.87	0.16	†	†
M6	14	M136901	0.69	0.33	†	-0.03	0.03
M6	15	M137001	0.59	0.71	0.20	†	†
M7	2	M170001	0.55	-1.17	0.14	†	†
M7	9	M157201	0.71	0.33	0.11	†	†
M8	6	M072301	0.56	-1.51	0.08	†	†
M8	13	M040001	0.79	-0.17	†	†	†
M9	6	M155401	0.75	-1.18	0.09	†	†
M9	15	M160901	0.55	1.81	†	-1.35	1.35
M10	4	M137501	1.10	-0.99	†	†	†
M10	5	M137601	0.66	-0.51	0.14	†	†
M11	12	M154901	0.06	2.10	0.14	†	†
M11	14	M162301	0.72	0.69	0.09	†	†
M12	2	M148301	0.63	-1.52	0.08	†	†
	4	M148501	0.59	-0.41	†	-0.28	0.28
	5	M148601	0.96	0.30	0.24	†	†

Last updated 03 June 2016 (GF)