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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 Measurement Scale, by Block and Item, Grade 8 Mathematics State Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the measurement scale, by block and item, grade 8 mathematics state assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	3	M093201	0.51	1.29	0.16	†	†	†	†
	7A	M093601	0.87	1.50	0.00	1.22	-1.22	†	†
M4	2	M017501	0.33	-3.36	0.14	†	†	†	†
	8	M018101	0.52	-0.75	0.07	†	†	†	†
	18	M019101	1.15	1.64	0.16	†	†	†	†
	19	M019201	1.36	1.58	0.15	†	†	†	†
M6	7A	M020301	1.06	-0.39	0.00	†	†	†	†
M7	9A	M068008	0.48	1.92	0.00	0.16	-0.16	†	†
M8	2A	M012331	0.79	-1.47	0.18	†	†	†	†
	14A	M013331	1.00	-1.28	0.15	†	†	†	†
M9	1	M052301	1.65	0.71	0.25	†	†	†	†
M10	1	M085501	0.92	0.75	0.12	†	†	†	†
	2	M085601	0.98	0.05	0.20	†	†	†	†
M11	12	M047101	1.11	0.22	0.14	†	†	†	†
	13	M047201	0.72	-1.05	0.09	†	†	†	†
	18A	M047901	1.11	1.46	0.00	†	†	†	†
M13	2A	M051301	0.37	-2.68	0.00	†	†	†	†
	11A	M052201	0.67	0.94	0.00	0.69	-0.39	-0.30	†
M14	1A	M072801	0.66	0.41	0.32	†	†	†	†
	6A	M073301	1.12	1.43	0.26	†	†	†	†
M15	1A	M075201	0.62	-0.43	0.28	†	†	†	†
	3A	M075401	0.48	0.11	0.00	1.03	-1.03	†	†
	5A	M075601	0.59	0.18	0.00	-0.76	0.76	†	†
	9A	M076001	0.53	1.49	0.00	-1.48	0.31	1.17	†
† 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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