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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 8 Reading Combined National and State Main Assessment: 2005

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: 2005

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† 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, 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), 2005 Reading Assessment.
R6	1	R013201	0.69	0.71	†	1.08	-0.09	-0.99
	2	R013202	0.70	-0.61	0.24	†	†	†
	3	R013203	1.11	-1.95	0.00	†	†	†
	4	R013204	0.97	-0.37	0.28	†	†	†
	5	R013205	1.00	-1.45	0.00	†	†	†
	6	R013206	0.80	#	0.20	†	†	†
	7	R013207	0.62	-0.80	0.00	†	†	†
	8	R013208	1.69	-0.31	0.22	†	†	†
	9	R013209	0.71	1.15	0.00	†	†	†
	10	R013210	1.04	2.28	0.34	†	†	†
	11	R013211	0.42	0.52	0.00	†	†	†
	12	R013212	0.50	1.58	†	1.93	-0.53	-1.40
R7	1	R012701	1.14	-1.37	0.43	†	†	†
	2	R012702	0.65	-2.24	0.00	†	†	†
	3	R012707	2.28	-0.93	0.39	†	†	†
	4	R012704	1.28	-0.58	0.19	†	†	†
	5	R012705	0.90	0.09	0.00	†	†	†
	6	R012706	0.46	0.58	0.00	†	†	†
	7	R012711	1.00	-0.38	0.20	†	†	†
	8	R012703	0.85	-0.32	0.00	†	†	†
	9	R012709	0.84	-0.87	0.37	†	†	†
	10	R012714	0.56	0.47	†	1.42	0.73	-2.15
	11	R012710	0.67	-0.82	0.00	†	†	†
	12	R012712	1.03	0.05	0.30	†	†	†
	13	R012713	1.19	-0.69	0.00	†	†	†
R8	1	R053401	0.46	-0.02	†	0.68	-0.68	†
	2	R053402	0.81	-1.76	0.00	†	†	†
	3	R053403	1.41	-0.93	0.28	†	†	†
	4	R053404	0.92	0.39	0.19	†	†	†
	5	R053405	0.47	-0.63	†	2.07	-1.62	-0.45
	6	R053406	1.24	-0.92	0.19	†	†	†
	7	R053407	0.92	-1.59	0.22	†	†	†
	8	R053408	0.34	-1.83	0.00	†	†	†
	9	R053409	0.60	-0.76	0.19	†	†	†
	10	R053410	0.37	-1.46	0.00	†	†	†
	11	R053411	1.25	-0.12	0.35	†	†	†
R13	1	R016201	0.38	-3.90	†	0.90	-0.90	†
	2	R016202	0.56	0.12	†	2.02	-2.02	†
	3	R016203	0.62	-0.68	0.34	†	†	†
	4	R016204	0.54	-0.75	†	2.79	0.88	-3.67
	5	R016205	0.62	0.73	†	1.59	-1.59	†
	6	R016206	0.89	-1.04	0.32	†	†	†
	7	R016207	0.53	0.27	†	0.30	-0.30	†
	8	R016208	1.07	-0.96	0.34	†	†	†
	9	R016209	1.21	-0.70	0.21	†	†	†
	10	R016210	0.57	0.83	†	2.01	0.34	-2.36
	11	R016211	0.46	-2.19	†	2.32	-2.32	†
	12	R016212	0.34	-0.07	†	0.26	-0.26	†
	13	R016213	0.46	-1.14	†	†	†	†
R14	1	R027301	1.15	-1.07	0.61	†	†	†
	2	R026401	1.03	-0.95	0.37	†	†	†
	3	R026501	0.57	0.20	0.00	†	†	†
	4	R027101	1.30	-0.87	0.26	†	†	†
	5	R026601	1.56	-1.04	0.43	†	†	†
	6	R028201	1.05	0.18	0.23	†	†	†
	7	R026801	0.41	0.11	†	0.00	1.36	-1.37
	8	R027201	0.56	-0.63	†	0.89	-0.89	†
	9	R026901	1.67	-0.23	0.28	†	†	†
	10	R027001	0.66	-1.22	0.00	†	†	†

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