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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 8 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 8 mathematics national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
M3	9	M093801	0.21	0.05	0.00	-4.72	3.92	0.80	†
M4	5	M017801	1.14	-0.69	0.19	†	†	†	†
	16	M018901	0.56	1.02	0.19	†	†	†	†
M5	2	M067101	1.10	-0.30	0.14	†	†	†	†
	11	M067501	0.57	1.29	0.00	0.83	-0.83	†	†
M6	6	M020201	0.57	-2.23	0.00	†	†	†	†
	10	M020801	0.98	1.47	0.00	†	†	†	†
	13	M021101	0.94	-0.01	0.00	†	†	†	†
M8	5	M012631	1.43	0.44	0.24	†	†	†	†
	9	M013031	1.01	1.37	0.00	†	†	†	†
	10	M013131	0.79	1.14	0.00	†	†	†	†
M9	5	M052701	1.01	0.43	0.16	†	†	†	†
	6	M052801	0.08	12.69	0.05	†	†	†	†
	9	M053101	0.66	1.17	0.00	0.30	0.13	-0.43	†
M11	7	M046601	1.03	-1.06	0.00	†	†	†	†
	11	M047001	1.00	-0.25	0.13	†	†	†	†
	14	M047301	1.10	-1.81	0.00	†	†	†	†
	17	M047801	1.53	0.67	0.11	†	†	†	†
M12	2	M092201	1.06	0.48	0.14	†	†	†	†
	6	M092601	0.80	1.45	0.00	-0.51	0.51	†	†
M13	3	M051401	0.89	-1.14	0.11	†	†	†	†
M14	2	M072901	0.44	-0.60	0.00	-0.86	0.86	†	†
	5	M0732CL	0.36	-0.40	0.00	1.10	-0.17	-0.93	†
	8	M073501	0.11	5.80	0.00	†	†	†	†
† 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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