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

NAEP Technical DocumentationIRT parameters for the data analysis, statistics, and probability 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	2	M055901	0.38	-1.83	0.15	†	†	†	†
	13	M057001	1.38	1.53	0.00	†	†	†	†
M4	5	M017801	1.22	-1.05	0.27	†	†	†	†
	16	M018901	1.11	1.21	0.22	†	†	†	†
M5	4	M070801	0.90	-0.36	0.00	†	†	†	†
	5	M070901	0.98	0.85	0.12	†	†	†	†
M6	2	M021501	1.09	-0.45	0.00	†	†	†	†
	3	M021502	0.86	-1.36	0.00	†	†	†	†
	6	M020201	0.66	-2.35	0.00	†	†	†	†
	10	M020801	0.88	0.87	0.00	†	†	†	†
	13	M021101	0.89	-0.40	0.00	†	†	†	†
M7	0	M0716CL	0.48	0.19	0.00	-0.69	0.10	0.18	0.41
	4	M071601	1.23	0.22	0.29	†	†	†	†
	5	M071602	0.90	0.41	0.00	-0.06	0.06	†	†
	10	M071801	0.33	0.93	0.00	1.61	-1.95	0.35	†
M8	5	M012631	1.15	-0.74	0.24	†	†	†	†
	9	M013031	0.89	0.62	0.00	†	†	†	†
	10	M013131	0.68	0.49	0.00	†	†	†	†
	16	M011631	0.80	-0.12	0.23	†	†	†	†
M9	5	M052701	0.92	-0.49	0.15	†	†	†	†
	6	M052801	0.43	3.49	0.20	†	†	†	†
	9	M053401	0.29	0.87	0.00	-0.30	2.26	0.26	-2.22
M10	8	M094601	1.53	2.11	0.04	†	†	†	†
M11	12	M059701	0.22	3.21	0.19	†	†	†	†
	13	M059702	0.72	1.44	0.00	†	†	†	†
M12	2	M092201	1.23	0.00	0.13	†	†	†	†
	6	M092601	0.89	0.58	0.00	-0.40	0.40	†	†
M13	3	M094801	0.89	1.49	0.13	†	†	†	†
M14	5	M0732CL	0.45	-1.16	0.00	0.86	-0.19	-0.67	†
M15	3	M076301	0.74	0.77	0.16	†	†	†	†
† 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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