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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 National Main Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the measurement scale, by block and item, grade 8 mathematics national main assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	3	M093201	0.69	1.54	0.25	†	†	†	†
	7A	M093601	0.82	1.53	0.00	1.28	-1.28	†	†
M4	2	M017501	0.34	-2.98	0.19	†	†	†	†
	8	M018101	0.58	-0.45	0.17	†	†	†	†
	18	M019101	1.38	1.56	0.17	†	†	†	†
	19	M019201	1.40	1.55	0.14	†	†	†	†
M6	7A	M020301	0.99	-0.44	0.00	†	†	†	†
M7	9A	M068008	0.44	1.98	0.00	0.31	-0.31	†	†
M8	2A	M012331	0.70	-1.59	0.21	†	†	†	†
	14A	M013331	0.98	-1.24	0.20	†	†	†	†
M9	1	M052301	1.67	0.64	0.21	†	†	†	†
M10	1	M085501	1.44	0.82	0.17	†	†	†	†
	2	M085601	0.93	-0.04	0.21	†	†	†	†
M11	12	M047101	1.11	0.23	0.15	†	†	†	†
	13	M047201	0.74	-1.00	0.16	†	†	†	†
	18A	M047901	1.10	1.52	0.00	†	†	†	†
M13	2A	M051301	0.37	-2.72	0.00	†	†	†	†
	11A	M052201	0.78	0.92	0.00	0.71	-0.38	-0.33	†
M14	1A	M072801	0.64	0.36	0.30	†	†	†	†
	6A	M073301	1.09	1.29	0.23	†	†	†	†
M15	1A	M075201	0.62	-0.48	0.23	†	†	†	†
	3A	M075401	0.51	0.22	0.00	1.09	-1.09	†	†
	5A	M075601	0.53	0.26	0.00	-0.99	0.99	†	†
	9A	M076001	0.49	1.43	0.00	-1.77	0.82	0.95	†
† 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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