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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 8 Mathematics State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the data analysis, statistics, and probability scale, by block and item, grade 8 mathematics state assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	9A	M093801	0.20	0.03	0.00	-4.92	3.62	1.31	†
M4	5	M017801	0.98	-0.71	0.20	†	†	†	†
	16	M018901	0.75	0.93	0.18	†	†	†	†
M5	2	M067101	0.90	-0.43	0.10	†	†	†	†
	11A	M067501	0.59	1.17	0.00	0.66	-0.66	†	†
M6	6A	M020201	0.52	-2.41	0.00	†	†	†	†
	10A	M020801	0.86	1.56	0.00	†	†	†	†
	13A	M021101	0.93	0.17	0.00	†	†	†	†
M8	5A	M012631	1.46	0.41	0.23	†	†	†	†
	9A	M013031	1.13	1.31	0.00	†	†	†	†
	10A	M013131	0.85	1.16	0.00	†	†	†	†
M9	5	M052701	1.09	0.58	0.18	†	†	†	†
	6	M052801	0.03	29.27	0.01	†	†	†	†
	9A	M053101	0.64	1.26	0.00	0.41	0.11	-0.53	†
M11	7A	M046601	1.22	-0.85	0.00	†	†	†	†
	11	M047001	1.03	-0.31	0.11	†	†	†	†
	14A	M047301	1.14	-1.63	0.00	†	†	†	†
	17	M047801	1.36	0.65	0.10	†	†	†	†
M12	2	M092201	1.02	0.52	0.10	†	†	†	†
	6A	M092601	0.85	1.43	0.00	-0.41	0.41	†	†
M13	3	M051401	0.92	-1.02	0.06	†	†	†	†
M14	2A	M072901	0.48	-0.59	0.00	-0.73	0.73	†	†
	5F	M0732CL	0.38	-0.33	0.00	1.08	-0.11	-0.97	†
	8A	M073501	0.06	9.63	0.00	†	†	†	†
† 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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