NAEP Analysis and Scaling - IRT Parameters for Items in the Reading to Gain Information Scale, by Block and Item, Grade 12 Reading National Main Assessment: 2005

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Reading Assessment Item Response Theory Parameters → IRT Parameters for Items in the Reading to Gain Information Scale, by Block and Item, Grade 12 Reading National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, by block and item, grade 12 reading national main assessment: 2005
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3
† 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 Reading Assessment.
R6	1	R013201	0.60	0.06	†	1.05	0.05	-1.10
	2	R013202	0.69	-1.48	0.20	†	†	†
	3	R013203	0.89	-2.40	0.00	†	†	†
	4	R013204	0.82	-1.53	0.21	†	†	†
	5	R013205	0.86	-2.34	0.00	†	†	†
	6	R013206	0.65	-0.81	0.20	†	†	†
	7	R013207	0.68	-1.37	0.00	†	†	†
	8	R013208	1.32	-1.35	0.22	†	†	†
	9	R013209	0.71	0.56	0.00	†	†	†
	10	R013210	0.90	1.11	0.24	†	†	†
	11	R013211	0.36	-0.40	0.00	†	†	†
	12	R013212	0.40	1.17	†	2.19	-0.62	-1.58
R7	1	R013701	0.44	0.03	0.00	†	†	†
	2	R013702	0.66	#	0.00	†	†	†
	3	R013703	0.92	-1.65	0.29	†	†	†
	4	R013704	0.76	1.63	0.00	†	†	†
	5	R013705	1.52	-1.06	0.26	†	†	†
	6	R013706	0.61	-0.33	0.00	†	†	†
	7	R013707	0.72	-0.05	0.16	†	†	†
	8	R013708	0.31	0.85	0.00	†	†	†
	9	R013709	0.41	1.10	0.20	†	†	†
	10	R013710	0.63	1.38	0.00	†	†	†
	11	R013711	0.54	1.18	0.31	†	†	†
	12	R013712	0.59	0.48	0.00	†	†	†
R8	1	R053501	0.63	0.16	†	1.29	-1.29	†
	2	R053502	0.62	-2.41	0.27	†	†	†
	3	R053503	0.85	0.14	0.19	†	†	†
	4	R053504	0.99	-1.20	0.00	†	†	†
	5	R053505	1.18	-0.46	0.34	†	†	†
	6	R053506	1.05	0.44	0.27	†	†	†
	7	R053507	0.64	0.08	†	0.25	0.28	-0.53
	8	R053508	1.77	-0.14	0.34	†	†	†
	9	R053509	0.89	-0.78	0.00	†	†	†
	10	R053510	1.57	0.27	0.28	†	†	†
R13	1	R015501	0.86	-0.71	0.28	†	†	†
	2	R015502	0.85	0.04	0.26	†	†	†
	3	R015503	0.43	-3.05	0.00	†	†	†
	4	R015504	0.91	0.04	0.27	†	†	†
	5	R015505	0.47	0.25	0.00	†	†	†
	6	R015506	1.05	0.32	0.28	†	†	†
	7	R015507	0.84	0.45	†	1.56	0.10	-1.67
	8	R015508	1.32	-0.37	0.35	†	†	†
	9	R015509	1.02	0.44	0.00	†	†	†
	10	R015510	1.37	-0.04	0.28	†	†	†
	11	R015511	0.80	-0.54	0.26	†	†	†
	12	R015512	0.82	-0.45	0.00	†	†	†
	13	R015513	0.93	-0.68	0.27	†	†	†
	14	R015514	0.60	0.68	†	0.88	0.20	-1.08
	15	R015515	0.98	0.75	0.15	†	†	†
	16	R015516	0.71	-0.12	0.23	†	†	†
R14	1	R016501	0.94	0.55	†	1.58	-1.58	†
	2	R016502	1.05	1.02	†	1.12	-1.12	†
	3	R016601	0.62	0.59	†	1.31	-1.31	†
	4	R016602	0.61	0.82	†	0.93	-0.93	†
	6	R016604	0.51	-0.18	†	1.45	-1.45	†
	7	R016605	0.30	1.48	†	-1.91	1.91	†
	8	R016701	0.79	0.64	†	2.27	-0.76	-1.50

Last updated 27 July 2009 (JL)

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