NAEP Analysis and Scaling - IRT Parameters for Items in the Algebra and Functions Scale, by Block and Item, Grade 8 Mathematics National Main Assessment: 2005

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Mathematics Assessment Item Response Theory Parameters → IRT Parameters for Items in the Algebra and Functions Scale, by Block and Item, Grade 8 Mathematics Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the algebra and functions scale, by block and item, grade 8 mathematics combined national and state main assessment: 2005
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
† Not applicable; c parameters are not estimated for generalized partial credit models. 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. For item j, d_ji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005 Mathematics Assessment.
M3	5	M066201	0.77	-1.75	0.07	†	†	†	†
	10	M067401	0.92	1.28	0.18	†	†	†	†
	11	M086101	0.63	0.32	0.11	†	†	†	†
	12	M047701	1.01	1.29	0.26	†	†	†	†
	13	M067301	1.02	-0.03	0.16	†	†	†	†
M4	3	M067701	0.78	-2.01	0.06	†	†	†	†
	10	M066601	0.34	-0.85	†	-0.38	0.38	†	†
	11	M067201	0.59	1.22	†	0.22	-0.22	†	†
	20	M086301	0.25	-1.84	†	-1.87	1.87	†	†
M5	6	M019701	0.56	-2.23	0.00	†	†	†	†
M5	11	M066501	0.52	-0.96	†	-0.56	0.56	†	†
M6	2	M140501	1.56	-0.04	0.22	†	†	†	†
	6	M140901	0.91	0.43	0.13	†	†	†	†
	12	M141501	1.11	0.43	0.26	†	†	†	†
	16	M141901	0.45	1.66	†	2.16	0.95	-0.94	-2.18
M7	1	M143601	1.01	-0.94	0.07	†	†	†	†
	9	M144401	0.82	0.36	0.10	†	†	†	†
	14	M144901	0.54	0.99	†	0.03	-0.03	†	†
	15	M145001	1.55	0.36	0.19	†	†	†	†
M8	10	M052501	1.10	0.77	0.20	†	†	†	†
	16	M067001	1.28	0.54	0.33	†	†	†	†
	17	M051701	1.18	-0.09	0.13	†	†	†	†
M9	2	M0757CL	0.43	-1.21	†	2.38	-0.57	-1.81	†
	4	M091701	1.15	-0.86	0.18	†	†	†	†
	10	M075301	1.17	-0.29	†	1.18	-1.18	†	†
	14	M013731	1.07	0.92	0.12	†	†	†	†
M10	1	M142001	0.64	0.62	0.48	†	†	†	†
	7	M142601	1.11	-0.23	0.19	†	†	†	†
	8	M142701	1.19	0.27	0.09	†	†	†	†
	9	M142801	0.69	1.10	0.00	†	†	†	†
	14	M143301	1.10	0.58	0.23	†	†	†	†
M11	2	M105801	0.52	-1.15	0.09	†	†	†	†
	6	M106201	0.81	-0.45	0.29	†	†	†	†
	11	M106701	1.38	1.47	0.12	†	†	†	†
	15	M107101	0.57	0.62	0.14	†	†	†	†
	18	M107501	0.71	-1.16	0.00	†	†	†	†
M12	3	M110101	1.20	0.70	0.18	†	†	†	†
	10	M110801	0.18	2.43	0.05	†	†	†	†
	13	M111201	0.34	-0.46	0.09	†	†	†	†
	14	M111301	0.59	-1.84	0.15	†	†	†	†
	17	M111601	1.45	0.53	0.28	†	†	†	†

Last updated 19 February 2009 (GF)

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