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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment Item Response Theory Parameters → Reading Assessment Item Response Theory Parameters → IRT Parameters for the Reading to Gain Information Scale, by Block and Item, Grade 12 Reading National Main Assessment: 2002

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, by block and item, grade 12 reading national main assessment: 2002

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
R6	1	R013201	0.55	0.01	†	1.09	0.15	-1.23
	2	R013202	0.61	-1.69	0.21	†	†	†
	3	R013203	0.84	-2.30	0.00	†	†	†
	4	R013204	0.81	-1.61	0.20	†	†	†
	5	R013205	0.95	-2.34	0.00	†	†	†
	6	R013206	0.61	-0.82	0.23	†	†	†
	7	R013207	0.70	-1.39	0.00	†	†	†
	8	R013208	1.24	-1.53	0.22	†	†	†
	9	R013209	0.70	0.59	0.00	†	†	†
	10	R013210	0.88	1.16	0.23	†	†	†
	11	R013211	0.35	0.07	0.00	†	†	†
	12	R013212	0.46	1.38	†	2.17	-0.65	-1.52
R7	1	R013701	0.56	0.58	0.00	†	†	†
	2	R013702	0.81	0.12	0.00	†	†	†
	3	R013703	0.75	-1.91	0.26	†	†	†
	4	R013704	0.74	1.58	0.00	†	†	†
	5	R013705	1.56	-0.95	0.26	†	†	†
	6	R013706	0.65	-0.26	0.00	†	†	†
	7	R013707	0.71	0.05	0.17	†	†	†
	9	R013709	0.47	1.04	0.23	†	†	†
	10	R013710	0.56	1.66	0.00	†	†	†
	11	R013711	0.53	1.30	0.31	†	†	†
	12	R013712	0.68	-0.06	0.00	†	†	†
R8	1	R016401	0.81	-0.62	†	0.71	-0.71	†
	2	R016402	0.45	-0.21	0.00	†	†	†
	3	R016403	0.71	0.04	†	0.88	-0.88	†
	4	R016404	0.64	0.28	†	1.80	-1.80	†
	5	R016405	0.44	-0.44	†	-2.68	2.68	†
	6	R016406	0.53	-0.62	0.23	†	†	†
	7	R016407	0.50	0.07	†	0.45	-0.45	†
	8	R016408	0.42	0.97	†	0.00	1.01	-1.01
R13	1	R015501	0.76	-0.76	0.26	†	†	†
	2	R015502	0.88	0.15	0.29	†	†	†
	3	R015503	0.43	-3.28	0.00	†	†	†
	4	R015504	1.07	0.06	0.29	†	†	†
	5	R015505	0.52	0.29	0.00	†	†	†
	6	R015506	0.89	0.21	0.28	†	†	†
	7	R015507	0.89	0.47	†	1.60	0.04	-1.64
	8	R015508	1.34	-0.26	0.38	†	†	†
	9	R015509	0.96	0.46	0.00	†	†	†
	10	R015510	1.27	-0.06	0.28	†	†	†
	11	R015511	0.68	-0.80	0.24	†	†	†
	12	R015512	0.91	-0.41	0.00	†	†	†
	13	R015513	0.95	-0.62	0.25	†	†	†
	14	R015514	0.49	0.58	†	1.30	0.17	-1.47
	15	R015515	1.00	0.74	0.16	†	†	†
	16	R015516	0.70	-0.07	0.23	†	†	†
R14	1	R016501	0.96	0.64	†	1.79	-1.79	†
	2	R016502	1.04	0.96	†	1.13	-1.13	†
	3	R016601	0.63	0.52	†	1.24	-1.24	†
	4	R016602	0.53	0.64	†	0.67	-0.67	†
	6	R016604	0.48	-0.33	†	1.60	-1.60	†
	7	R016605	0.29	1.76	†	-1.87	1.87	†
	8	R016701	0.71	0.68	†	2.42	-0.91	-1.51
† Not applicable; c parameters are not estimated for generalized partial credit models. NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji 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, dji 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), 2002 Reading Assessment.

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