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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 8 Reading Combined National and State Main Assessment: 2003

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, by block and item, grade 8 reading combined national and state main assessment: 2003

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† 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), 2003 Reading Assessment.
R6	1	R013201	0.65	0.64	†	1.15	-0.11	-1.04
	2	R013202	0.75	-0.56	0.28	†	†	†
	3	R013203	0.91	-1.94	0.00	†	†	†
	4	R013204	1.04	-0.28	0.32	†	†	†
	5	R013205	0.99	-1.54	0.00	†	†	†
	6	R013206	0.83	0.06	0.23	†	†	†
	7	R013207	0.67	-0.92	0.00	†	†	†
	8	R013208	1.68	-0.34	0.24	†	†	†
	9	R013209	0.72	1.07	0.00	†	†	†
	10	R013210	1.24	2.13	0.33	†	†	†
	11	R013211	0.44	0.48	0.00	†	†	†
	12	R013212	0.48	1.52	†	2.00	-0.75	-1.25
R7	1	R012701	1.19	-1.32	0.46	†	†	†
	2	R012702	0.68	-2.20	0.00	†	†	†
	3	R012707	2.34	-0.89	0.41	†	†	†
	4	R012704	1.31	-0.59	0.20	†	†	†
	5	R012705	0.92	-0.03	0.00	†	†	†
	6	R012706	0.45	0.55	0.00	†	†	†
	7	R012711	0.99	-0.41	0.20	†	†	†
	8	R012703	0.83	-0.39	0.00	†	†	†
	9	R012709	0.98	-0.64	0.45	†	†	†
	10	R012714	0.55	0.49	†	1.42	0.82	-2.24
	11	R012710	0.72	-0.86	0.00	†	†	†
	12	R012712	0.98	0.10	0.28	†	†	†
	13	R012713	1.20	-0.72	0.00	†	†	†
R8	1	R017201	0.92	-0.68	0.39	†	†	†
	2	R017202	0.59	-0.53	†	0.80	-0.80	†
	3	R017203	0.94	-0.41	0.24	†	†	†
	4	R017204	0.80	0.25	†	1.01	-1.01	†
	5	R017205	0.55	0.54	†	1.94	0.64	-2.58
	6	R017206	0.81	0.58	0.31	†	†	†
	7	R017207	0.55	-0.17	0.00	†	†	†
	8	R017208	0.67	0.88	†	1.62	-1.62	†
	9	R017209	1.02	0.14	0.23	†	†	†
	10	R017210	0.52	1.17	0.00	†	†	†
R13	1	R016201	0.25	-5.29	†	1.01	-1.01	†
	2	R016202	0.54	-0.16	†	1.93	-1.93	†
	3	R016203	0.59	-0.75	0.31	†	†	†
	4	R016204	0.49	-0.56	†	3.45	1.26	-4.70
	5	R016205	0.62	0.72	†	1.63	-1.63	†
	6	R016206	0.93	-0.95	0.36	†	†	†
	7	R016207	0.56	0.28	†	0.27	-0.27	†
	8	R016208	1.01	-1.03	0.30	†	†	†
	9	R016209	1.22	-0.71	0.20	†	†	†
	10	R016210	0.56	0.82	†	2.06	0.37	-2.43
	11	R016211	0.49	-2.26	†	2.32	-2.32	†
	12	R016212	0.35	-0.06	†	0.25	-0.25	†
	13	R016213	0.45	-1.24	0.00	†	†	†
R14	1	R027301	1.11	-1.12	0.61	†	†	†
	2	R026401	0.96	-1.01	0.35	†	†	†
	3	R026501	0.57	0.33	0.00	†	†	†
	4	R027101	1.32	-0.86	0.26	†	†	†
	5	R026601	1.54	-0.99	0.47	†	†	†
	6	R028201	1.09	0.19	0.24	†	†	†
	7	R026801	0.40	0.16	†	0.04	1.33	-1.37
	8	R027201	0.51	-0.69	†	0.56	-0.56	†
	9	R026901	1.76	-0.21	0.29	†	†	†
	10	R027001	0.68	-1.21	0.00	†	†	†

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