NAEP Analysis and Scaling - IRT Parameters for Items in the Data Analysis, Statistics, and Probability Scale, by Block and Item, Grade 12 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 Data Analysis, Statistics, and Probability Scale, by Block and Item, Grade 12 Mathematics National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the data analysis, statistics, and probability scale, by block and item, grade 12 mathematics national 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	7	M011631	0.61	-1.16	0.15	†	†	†	†
	11	M070901	0.81	0.73	0.11	†	†	†	†
	13	M094801	0.76	1.64	0.11	†	†	†	†
M4	5	M071602	0.71	0.54	†	0.19	-0.19	†	†
	7	M0716CL	0.52	0.12	†	-0.54	-0.26	0.45	0.36
	15	M057001	1.26	1.64	†	†	†	†	†
	18	M071801	0.29	-0.29	†	-3.65	3.01	0.64	†
M5	8	M021501	1.22	-0.54	0.00	†	†	†	†
	9	M021502	1.29	-0.99	0.00	†	†	†	†
	15	M094601	1.63	2.32	0.04	†	†	†	†
M6	3	M134301	0.72	0.12	0.17	†	†	†	†
	5	M129801	0.67	-1.43	0.15	†	†	†	†
	7	M130601	0.86	0.42	0.19	†	†	†	†
	15	M132201	0.86	1.32	†	0.56	-0.56	†	†
M7	8	M134801	0.25	0.75	0.17	†	†	†	†
	10	M134001	0.61	-0.23	0.13	†	†	†	†
	17	M076901	0.43	2.02	†	-2.20	2.20	†	†
M8	4	M0732CL	0.54	-1.63	†	1.22	0.27	-0.54	-0.95
	8	M092201	1.06	-0.40	0.12	†	†	†	†
	13	M092601	0.83	0.78	†	-0.39	0.39	†	†
	16	M052801	1.16	2.49	0.22	†	†	†	†
M9	3	M013131	0.55	0.27	0.00	†	†	†	†
	8	M073701	0.80	-0.18	0.19	†	†	†	†
	11	M076301	0.86	0.71	0.15	†	†	†	†
M10	3	M070801	0.44	-0.03	†	-0.41	0.41	†	†
	11	M059701	0.28	2.14	0.18	†	†	†	†
	12	M059702	0.60	1.43	0.00	†	†	†	†
M11	6	M126001	1.08	0.93	0.00	†	†	†	†
	7	M131401	0.45	0.04	0.16	†	†	†	†
	12	M132001	0.50	-0.46	0.15	†	†	†	†
	18	M129001	0.64	0.70	†	1.63	-0.23	-0.32	-1.09
M12	2	M128801	0.34	0.78	0.16	†	†	†	†
	9	M130001	1.39	1.44	0.13	†	†	†	†
	10	M127901	0.48	-0.20	0.14	†	†	†	†
	16	M127301	0.54	3.95	0.10	†	†	†	†

Last updated 19 December 2008 (GF)

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