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

NAEP Technical DocumentationIRT parameters for items in the measurement and geometry 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, and d parameters are not estimated for two-parameter or three-parameter logistic models. # Rounds to zero. 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	1	M095501	0.86	0.59	0.16	†	†	†	†
	2	M095601	1.27	0.50	0.10	†	†	†	†
	3	M095101	1.46	0.92	0.20	†	†	†	†
	6	M056001	1.09	-0.92	0.14	†	†	†	†
	10	M011331	1.32	0.10	0.18	†	†	†	†
	4	M095301	0.73	0.81	†	-0.27	0.27	†	†
M4	2	M071502	0.65	0.22	†	-1.16	1.16	†	†
	1	M071501	1.11	-0.99	0.15	†	†	†	†
	8	M058701	1.08	-1.23	0.19	†	†	†	†
	12	M058901	0.75	-0.14	0.00	†	†	†	†
	13	M056701	1.70	1.48	0.18	†	†	†	†
M5	1	M093901	0.95	0.30	0.13	†	†	†	†
	2	M094001	0.78	-0.23	0.25	†	†	†	†
	4	M094301	0.95	0.83	†	0.68	-0.68	†	†
	6	M058501	0.65	-0.21	0.11	†	†	†	†
	10	M094401	1.02	-0.74	0.16	†	†	†	†
	16	M059501	1.22	1.87	0.28	†	†	†	†
	3	M094201	0.65	-0.13	†	0.36	0.08	-0.44	†
	14	M094101	1.59	2.03	0.28	†	†	†	†
M6	2	M127601	1.46	0.63	0.25	†	†	†	†
	6	M131701	0.49	0.52	0.18	†	†	†	†
	10	M127201	1.40	0.21	0.17	†	†	†	†
	9	M133201	0.97	2.09	0.05	†	†	†	†
	13	M021801	1.46	1.33	0.00	†	†	†	†
	17	M092801	1.37	1.47	0.20	†	†	†	†
M7	1	M125801	0.78	-0.98	0.20	†	†	†	†
	12	M133501	1.11	1.13	0.24	†	†	†	†
	16	M073901	0.74	1.14	†	-1.60	1.60	†	†
	2	M131101	0.64	-0.07	0.20	†	†	†	†
	5	M134501	1.29	0.99	0.16	†	†	†	†
	9	M128101	0.91	-0.25	0.17	†	†	†	†
M8	6	M073301	0.68	-0.47	0.17	†	†	†	†
	7	M021001	0.67	-1.31	0.00	†	†	†	†
	11	M092401	0.84	-0.23	†	1.24	-1.24	†	†
	12	M019201	1.47	0.86	0.17	†	†	†	†
	20	M076701	1.19	1.45	†	#	#	†	†
	9	M020901	0.68	-0.87	0.00	†	†	†	†
	19	M071301	1.03	1.67	†	0.06	-0.06	†	†
M9	10	M092301	0.71	0.31	†	0.41	-0.41	†	†
	15	M011931	2.59	1.73	0.00	†	†	†	†
	20	M092901	0.91	1.70	†	#	#	†	†
	9	M011731	1.18	-0.08	0.18	†	†	†	†
	13	M071101	0.59	0.70	†	-1.44	1.44	†	†
	18	M076801	0.86	1.58	†	-0.07	0.07	†	†
M10	1	M055801	0.64	-1.48	0.20	†	†	†	†
	17	M059801	1.27	1.99	0.00	†	†	†	†
	4	M059101	1.01	-0.25	0.25	†	†	†	†
	16	M053301	1.53	1.59	0.00	†	†	†	†
M11	2	M132801	0.93	-0.14	0.18	†	†	†	†
	5	M131001	1.00	1.02	0.10	†	†	†	†
	9	M126901	2.87	1.47	0.09	†	†	†	†
	10	M129301	1.23	-0.27	0.20	†	†	†	†
	14	M126201	1.08	-0.14	0.10	†	†	†	†
	16	M126801	0.68	0.07	0.19	†	†	†	†
M12	8	M128401	1.09	-1.21	0.17	†	†	†	†
	15	M135401	1.19	1.15	0.27	†	†	†	†
	18	M135501	0.59	#	†	1.39	-0.01	-0.82	-0.56
	1	M129101	0.81	0.61	0.20	†	†	†	†
	4	M128601	1.04	-0.64	0.15	†	†	†	†
	7	M132601	1.04	-1.03	0.19	†	†	†	†

Last updated 27 July 2009 (JL)

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