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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for the Data Analysis, Statistics, and Probability Scale, by Block and Item, Grade 4 Mathematics State Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the data analysis, statistics, and probability scale, by block and item, grade 4 mathematics state assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	11A	M040001	1.00	0.17	0.00	†	†	†	†
	12	M040101	0.79	0.11	0.28	†	†	†	†
M4	5	M017801	0.78	0.59	0.16	†	†	†	†
M5	10A	M066901	0.29	0.62	0.00	-1.10	-2.05	1.95	†
M6	6A	M020201	0.81	-0.36	0.00	†	†	†	†
M8	11A	N250231	0.95	-0.12	0.13	†	†	†	†
M9	10A	M091401	0.45	1.40	0.00	-1.93	2.01	0.18	†
M11	7A	M046601	1.15	0.43	0.00	†	†	†	†
	11	M047001	1.51	1.52	0.16	†	†	†	†
	14A	M047301	1.48	-0.40	0.00	†	†	†	†
M12	2A	M086501	0.73	-0.97	0.16	†	†	†	†
M13	6	M043101	1.23	0.43	0.26	†	†	†	†
	7A	M043201	0.73	-0.94	0.00	†	†	†	†
M14	6A	M072301	0.65	-0.49	0.18	†	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji is the category threshold parameter for category i. The c-parameter value is exactly zero for items scaled with the two-parameter logistic model or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Mathematics Assessment.

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