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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 Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the data analysis, statistics, and probability scale, by block and item, grade 4 mathematics state assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	11A	M040001	0.98	0.18	0.00	†	†	†	†
	12	M040101	0.77	0.04	0.24	†	†	†	†
M4	5	M017801	0.77	0.63	0.16	†	†	†	†
M5	10A	M066901	0.28	0.64	0.00	-1.12	-2.11	2.04	†
M6	6A	M020201	0.82	-0.32	0.00	†	†	†	†
M8	11A	N250231	0.93	-0.14	0.12	†	†	†	†
M9	10A	M091401	0.44	1.44	0.00	-2.01	2.11	0.13	†
M11	7A	M046601	1.19	0.45	0.00	†	†	†	†
	11	M047001	1.53	1.55	0.15	†	†	†	†
	14A	M047301	1.41	-0.40	0.00	†	†	†	†
M12	2A	M086501	0.70	-0.96	0.15	†	†	†	†
M13	6	M043101	1.18	0.45	0.26	†	†	†	†
	7A	M043201	0.74	-0.90	0.00	†	†	†	†
M14	6A	M072301	0.66	-0.49	0.17	†	†	†	†
† 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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