NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Reading Assessments → IRT Parameters for Items in the Reading to Gain Information Scale, Grade 8 Reading Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, grade 8 reading combined national and state assessments, by item and block: 2011

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. 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 represents 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), 2011 Reading Assessment.
R3	1	R060101	0.55	-0.62	0.34	†	†	†
	2	R060102	0.90	-0.11	0.31	†	†	†
	3	R060103	0.64	-0.60	†	†	†	†
	4	R060104	0.93	-0.57	0.34	†	†	†
	5	R060105	0.88	-0.20	†	†	†	†
	6	R060106	1.02	-0.37	0.19	†	†	†
	7	R060107	1.12	0.66	0.22	†	†	†
	8	R060108	0.49	0.28	†	0.04	0.81	-0.84
	9	R060109	0.87	0.75	0.19	†	†	†
	10	R060110	0.63	0.79	0.22	†	†	†
R4	1	R060301	0.65	-1.28	†	†	†	†
	2	R060302	0.82	-0.51	0.23	†	†	†
	3	R060304	1.09	0.11	0.59	†	†	†
	4	R060305	0.76	1.24	†	1.73	-1.73	†
	5	R060303	1.38	0.44	0.19	†	†	†
	6	R060306	0.64	0.92	†	1.37	-1.37	†
	7	R060307	0.80	0.09	0.21	†	†	†
	8	R060308	0.86	0.67	0.24	†	†	†
	9	R060309	0.48	0.52	†	†	†	†
	10	R060310	1.33	0.24	0.26	†	†	†
R7	1	R058801	1.70	-1.07	0.35	†	†	†
	2	R058802	1.22	-1.70	0.23	†	†	†
	3	R058803	1.81	-1.14	0.26	†	†	†
	4	R058804	0.83	-1.14	0.21	†	†	†
	5	R058805	0.23	0.54	†	†	†	†
	6	R058806	0.54	-0.41	0.21	†	†	†
	7	R058807	0.42	-1.42	†	0.54	0.62	-1.16
	8	R058808	0.96	-0.58	0.28	†	†	†
	9	R058809	1.01	-0.76	0.26	†	†	†
	10	R058810	0.38	-0.99	†	1.50	-1.50	†
R8	1	R059101	0.35	-0.28	0.16	†	†	†
	2	R059102	0.74	-2.13	0.15	†	†	†
	3	R059103	0.79	-0.71	0.16	†	†	†
	4	R059104	1.17	-1.90	0.25	†	†	†
	5	R059109	0.47	-0.16	†	0.68	-0.68	†
	6	R059106	0.45	-0.01	†	1.87	-0.64	-1.23
	7	R059105	0.90	-0.50	0.26	†	†	†
	8	R059107	0.43	-1.81	0.06	†	†	†
	9	R059108	0.38	-0.30	†	-0.35	0.35	†
	10	R059110	0.50	-0.99	†	†	†	†
R11	1	R060801	1.16	-0.05	0.21	†	†	†
	2	R060803	0.59	0.10	†	1.10	-1.10	†
	3	R060804	0.97	-0.48	0.37	†	†	†
	4	R060805	0.81	0.43	0.32	†	†	†
	5	R060806	1.35	-0.71	0.34	†	†	†
	6	R060807	0.67	-0.77	†	†	†	†
	7	R060808	0.45	0.60	†	0.76	-0.01	-0.76
	8	R060802	0.46	0.91	0.36	†	†	†
	9	R060809	1.78	0.04	0.29	†	†	†
	10	R060810	0.51	0.48	†	0.76	-0.76	†
	11	R060811	0.35	-0.94	†	0.30	-0.30	†
R12	1	R061001	0.99	-1.17	0.20	†	†	†
	2	R061002	0.99	-0.30	0.37	†	†	†
	3	R061003	0.72	-0.28	†	0.61	-0.61	†
	4	R061004	0.77	-1.70	†	†	†	†
	5	R061005	0.39	-0.83	0.12	†	†	†
	6	R061006	0.76	-0.23	†	†	†	†
	7	R061007	0.46	0.43	†	1.57	-1.84	0.27
	8	R061008	1.12	-0.02	0.25	†	†	†
	9	R061009	1.24	-0.87	0.27	†	†	†
	10	R061010	0.51	0.98	†	1.65	-1.65	†
R13	1	R061301	0.66	-1.27	†	1.04	-1.04	†
	2	R061302	0.73	-1.63	0.27	†	†	†
	3	R061303	0.61	0.09	†	1.63	-1.63	†
	4	R061304	0.47	0.42	†	†	†	†
	5	R061305	0.81	-1.55	0.19	†	†	†
	6	R061306	0.95	-0.58	0.18	†	†	†
	7	R061307	0.47	-0.41	†	1.07	-0.29	-0.78
	8	R061308	0.56	0.05	0.30	†	†	†
	9	R061309	0.36	-1.02	†	0.73	-0.73	†

Printer-friendly Version