NAEP Analysis and Scaling - IRT Parameters for the Number Sense, Properties, and Operations Scale, by Block and Item, Grade 8 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000

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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 Number Sense, Properties, and Operations Scale, by Block and Item, Grade 8 Mathematics National Main Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the number sense, properties, and operations scale, by block and item, grade 8 mathematics national main assessment (accommodations not permitted [R2]): 2000
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
M3	2	M093101	0.82	0.08	0.18	†	†	†	†
M4	1	M017401	0.20	-6.29	0.26	†	†	†	†
	4	M017701	1.03	-0.80	0.25	†	†	†	†
	6	M017901	1.42	-0.70	0.27	†	†	†	†
	9	M018201	0.58	-0.73	0.12	†	†	†	†
	11	M018401	1.07	-0.86	0.30	†	†	†	†
	12	M018501	1.52	0.49	0.25	†	†	†	†
	13	M018601	0.87	0.87	0.15	†	†	†	†
M5	5	M066401	0.59	-0.19	0.20	†	†	†	†
M6	4	M020001	0.69	-0.42	0.00	†	†	†	†
	5	M020101	1.14	-0.52	0.00	†	†	†	†
	9	M020501	0.82	-0.38	0.00	†	†	†	†
M7	3	M067801	0.82	-1.32	0.20	†	†	†	†
M8	3	M012431	0.91	-0.27	0.10	†	†	†	†
	4	M012531	0.75	0.49	0.10	†	†	†	†
	8	M012931	1.25	0.85	0.22	†	†	†	†
	12	N202831	0.68	-2.09	0.24	†	†	†	†
	13	M011131	0.66	-1.33	0.26	†	†	†	†
	15	M013431	1.43	0.12	0.21	†	†	†	†
	16	M013531	1.03	1.10	0.12	†	†	†	†
	17	M013631	1.33	0.54	0.05	†	†	†	†
M9	2	M052401	0.89	0.79	0.00	†	†	†	†
	7	M052901	0.67	-0.07	0.00	†	†	†	†
	8	M053001	0.96	1.09	0.00	†	†	†	†
M10	6	M086001	1.02	1.06	0.21	†	†	†	†
M11	1	M046001	0.36	-3.24	0.00	†	†	†	†
	4	M046301	0.96	-1.21	0.26	†	†	†	†
	6	M046501	0.97	-0.29	0.29	†	†	†	†
	9	M046801	0.59	-1.33	0.00	†	†	†	†
	10	M046901	0.98	-1.59	0.00	†	†	†	†
M12	1	M091501	1.19	0.47	0.18	†	†	†	†
	3	M091601	0.89	0.10	0.17	†	†	†	†
	8	M091901	0.50	-0.13	0.15	†	†	†	†
M13	1	M051201	0.51	-1.69	0.00	†	†	†	†
	4	M051501	1.07	1.57	0.23	†	†	†	†
	5	M051601	0.68	-0.96	0.00	†	†	†	†
	8	M051901	1.59	0.59	0.08	†	†	†	†
M14	3	M073001	1.38	0.02	0.18	†	†	†	†
	4	M073101	0.87	0.91	0.36	†	†	†	†
	7	M073402	1.95	1.60	0.17	†	†	†	†
	9	M073601	0.53	1.17	0.00	-0.17	-0.42	0.59	†
	9	M073602	0.72	1.20	0.48	†	†	†	†
M15	8	M075901	0.65	0.92	0.20	†	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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.

Last updated 14 July 2008 (KL)

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