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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: 2002

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: 2002

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), 2002 Reading Assessment.
R6	1	R013201	0.60	0.70	†	1.19	-0.11	-1.07
	2	R013202	0.78	-0.47	0.32	†	†	†
	3	R013203	0.80	-1.90	0.00	†	†	†
	4	R013204	1.06	-0.26	0.33	†	†	†
	5	R013205	0.98	-1.66	0.00	†	†	†
	6	R013206	0.86	0.13	0.26	†	†	†
	7	R013207	0.69	-1.02	0.00	†	†	†
	8	R013208	1.67	-0.33	0.25	†	†	†
	9	R013209	0.73	1.09	0.00	†	†	†
	10	R013210	1.20	2.15	0.32	†	†	†
	11	R013211	0.43	0.42	0.00	†	†	†
	12	R013212	0.48	1.59	†	1.94	-0.66	-1.28
R7	1	R012701	1.15	-1.40	0.43	†	†	†
	2	R012702	0.75	-2.12	0.00	†	†	†
	3	R012707	2.31	-0.90	0.42	†	†	†
	4	R012704	1.26	-0.65	0.18	†	†	†
	5	R012705	0.93	-0.09	0.00	†	†	†
	6	R012706	0.46	0.57	0.00	†	†	†
	7	R012711	0.97	-0.42	0.20	†	†	†
	8	R012703	0.83	-0.46	0.00	†	†	†
	9	R012709	1.05	-0.53	0.48	†	†	†
	10	R012708	0.51	0.25	†	1.61	0.47	-2.08
	11	R012710	0.77	-0.95	0.00	†	†	†
	12	R012712	0.91	0.14	0.27	†	†	†
	13	R012713	1.22	-0.72	0.00	†	†	†
R8	1	R017201	0.89	-0.65	0.40	†	†	†
	2	R017202	0.59	-0.54	†	0.88	-0.88	†
	3	R017203	0.93	-0.46	0.18	†	†	†
	4	R017204	0.83	0.22	†	1.03	-1.03	†
	5	R017205	0.48	0.33	†	1.51	0.49	-2.00
	6	R017206	1.14	0.74	0.38	†	†	†
	7	R017207	0.59	-0.17	0.00	†	†	†
	8	R017208	0.63	1.09	†	1.44	-1.44	†
	9	R017209	1.13	0.23	0.26	†	†	†
	10	R017210	0.52	1.08	0.00	†	†	†
R13	1	R016201	0.40	-4.22	†	-0.04	0.04	†
	2	R016202	0.54	-0.96	†	2.94	-2.94	†
	3	R016203	0.58	-0.78	0.30	†	†	†
	4	R016204	0.51	-0.67	†	3.23	1.07	-4.30
	5	R016205	0.62	0.68	†	1.65	-1.65	†
	6	R016206	0.95	-0.91	0.38	†	†	†
	7	R016207	0.56	0.29	†	0.24	-0.24	†
	8	R016208	0.99	-1.02	0.31	†	†	†
	9	R016209	1.26	-0.67	0.21	†	†	†
	10	R016210	0.55	0.80	†	2.07	0.33	-2.40
	11	R016211	0.46	-2.41	†	2.47	-2.47	†
	12	R016212	0.36	-0.04	†	0.24	-0.24	†
	13	R016213	0.41	-0.77	†	†	†	†

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