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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 National Main 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 national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	11	M040001	0.88	0.17	0.00	†	†	†	†
	12	M040101	1.02	0.49	0.38	†	†	†	†
M4	5	M017801	0.84	0.69	0.22	†	†	†	†
M5	10	M066901	0.28	0.65	0.00	-1.42	-2.29	2.57	1.14
M6	6	M020201	0.84	-0.25	0.00	†	†	†	†
M8	11	N250231	1.20	0.09	0.22	†	†	†	†
M9	10	M091401	0.47	1.33	0.00	-1.99	1.92	0.30	-0.23
M11	7	M046601	1.18	0.44	0.00	†	†	†	†
	11	M047001	1.88	1.42	0.17	†	†	†	†
	14	M047301	1.25	-0.44	0.00	†	†	†	†
M12	2	M086501	0.97	-0.67	0.20	†	†	†	†
M13	6	M043101	1.83	0.54	0.31	†	†	†	†
	7	M043201	0.75	-0.91	0.00	†	†	†	†
M14	6	M072301	0.64	-0.23	0.25	†	†	†	†
† 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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