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

NAEP Technical DocumentationIRT parameters for the measurement scale, by block and item, grade 12 mathematics national main assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	1	M055801	0.61	-1.75	0.22	†	†	†	†
M4	2	M017501	0.46	-2.68	0.22	†	†	†	†
	8	M018101	0.56	-0.93	0.21	†	†	†	†
	18	M019101	0.98	0.97	0.21	†	†	†	†
	19	M019201	2.15	0.94	0.19	†	†	†	†
M6	7	M020301	1.06	-1.23	0.00	†	†	†	†
M7	1	M071501	1.31	-0.85	0.22	†	†	†	†
	2	M071502	0.73	0.39	0.00	-1.06	1.06	†	†
M8	2	M012331	0.66	-2.37	0.20	†	†	†	†
	13	M011331	2.02	0.35	0.22	†	†	†	†
	19	M011931	1.84	1.91	0.00	†	†	†	†
M9	1	M052301	2.14	0.11	0.26	†	†	†	†
M10	6	M094401	1.21	-0.56	0.20	†	†	†	†
M11	1	M058501	0.92	0.18	0.15	†	†	†	†
	14	M059801	1.22	1.98	0.00	†	†	†	†
M12	3	M092301	0.87	0.16	0.00	0.59	-0.59	†	†
	9	M092901	0.53	1.75	0.00	1.20	-1.17	0.27	-0.30
M13	1	M095501	1.72	0.75	0.31	†	†	†	†
	2	M095601	1.77	0.51	0.13	†	†	†	†
	6	M095101	2.01	0.96	0.22	†	†	†	†
M14	2	M073801	0.64	0.55	0.00	-1.57	1.57	†	†
	6	M073301	0.68	0.04	0.22	†	†	†	†
M15	9	M076901	0.49	1.95	0.00	-2.32	2.32	†	†
† 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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