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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 Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the data analysis, statistics, and probability scale, by block and item, grade 12 mathematics national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	2	M055901	0.42	-1.67	0.16	†	†	†	†
	13	M057001	1.31	1.53	0.00	†	†	†	†
M4	5	M017801	1.41	-1.02	0.36	†	†	†	†
	16	M018901	1.04	1.38	0.26	†	†	†	†
M5	4	M070801	0.58	0.08	0.00	-0.17	0.17	†	†
	5	M070901	0.94	0.82	0.11	†	†	†	†
M6	2	M021501	1.03	-0.45	0.00	†	†	†	†
	3	M021502	0.83	-1.42	0.00	†	†	†	†
	6	M020201	0.63	-2.48	0.00	†	†	†	†
	10	M020801	0.87	0.82	0.00	†	†	†	†
	13	M021101	0.87	-0.45	0.00	†	†	†	†
M7	0	M0716CL	0.53	0.17	0.00	-0.49	-0.03	0.26	0.25
	4	M071601	1.17	0.19	0.27	†	†	†	†
	5	M071602	0.93	0.38	0.00	-0.04	0.04	†	†
	10	M071801	0.30	0.99	0.00	1.70	-2.14	0.44	†
M8	5	M012631	1.09	-0.84	0.21	†	†	†	†
	9	M013031	0.81	0.66	0.00	†	†	†	†
	10	M013131	0.60	0.55	0.00	†	†	†	†
	16	M011631	0.71	-0.28	0.18	†	†	†	†
M9	5	M052701	0.99	-0.44	0.21	†	†	†	†
	6	M052801	0.31	4.24	0.19	†	†	†	†
	9	M053401	0.28	0.88	0.00	-0.42	2.44	0.32	-2.34
M10	8	M094601	1.48	2.10	0.04	†	†	†	†
M11	12	M059701	0.28	2.60	0.20	†	†	†	†
	13	M059702	0.83	1.31	0.00	†	†	†	†
M12	2	M092201	1.17	-0.03	0.13	†	†	†	†
	6	M092601	0.91	0.55	0.00	-0.36	0.36	†	†
M13	3	M094801	0.83	1.51	0.13	†	†	†	†
M14	5	M0732CL	0.41	-1.31	0.00	0.88	-0.14	-0.73	†
M15	3	M076301	0.70	0.68	0.15	†	†	†	†
† 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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