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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 Not Permitted [R2]): 2000

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

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	3	M093201	0.75	1.53	0.27	†	†	†	†
	7	M093601	0.80	1.54	0.00	1.30	-1.30	†	†
M4	2	M017501	0.33	-3.13	0.19	†	†	†	†
	8	M018101	0.54	-0.48	0.16	†	†	†	†
	18	M019101	1.61	1.53	0.17	†	†	†	†
	19	M019201	1.20	1.56	0.14	†	†	†	†
M6	7	M020301	0.90	-0.43	0.00	†	†	†	†
M7	9	M068008	0.41	2.12	0.00	0.34	-0.34	†	†
M8	2	M012331	0.61	-1.73	0.24	†	†	†	†
	14	M013331	0.98	-1.27	0.21	†	†	†	†
M9	1	M052301	1.79	0.61	0.22	†	†	†	†
M10	1	M085501	1.34	0.78	0.17	†	†	†	†
	2	M085601	0.92	-0.06	0.20	†	†	†	†
M11	12	M047101	1.04	0.22	0.16	†	†	†	†
	13	M047201	0.76	-0.99	0.17	†	†	†	†
	18	M047901	1.27	1.47	0.00	†	†	†	†
M13	2	M051301	0.38	-2.80	0.00	†	†	†	†
	11	M052201	0.84	0.86	0.00	0.73	-0.32	-0.41	†
M14	1	M072801	0.49	0.16	0.24	†	†	†	†
	6	M073301	1.23	1.26	0.24	†	†	†	†
M15	1	M075201	0.58	-0.48	0.23	†	†	†	†
	3	M075401	0.56	0.21	0.00	0.98	-0.98	†	†
	5	M075601	0.55	0.22	0.00	-0.89	0.89	†	†
	9	M076001	0.46	1.45	0.00	-1.90	0.96	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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