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 for Literary Experience Scale, Grade 8 Reading Combined National and State Assessments, By Item and Block: 2011

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience 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.
R1	1	R059601	0.44	0.09	0.08	†	†	†
	2	R059602	0.51	-0.45	0.14	†	†	†
	3	R059603	0.86	-0.61	0.15	†	†	†
	4	R059604	0.67	-1.56	†	†	†	†
	5	R059610	0.38	-0.10	†	0.92	-1.39	0.47
	6	R059606	0.65	-0.65	†	0.45	-0.45	†
	7	R059605	0.69	0.83	†	0.93	-0.93	†
	8	R059608	0.85	0.08	0.38	†	†	†
	9	R059609	0.85	-1.30	0.35	†	†	†
	10	R059607	0.49	-0.77	†	0.21	-0.21	†
R2	1	R059801	1.09	0.77	0.14	†	†	†
	2	R059802	0.21	2.77	0.11	†	†	†
	3	R059803	0.55	0.63	†	1.33	0.14	-1.47
	4	R059804	0.85	-0.72	0.34	†	†	†
	5	R059805	0.98	-0.21	0.40	†	†	†
	6	R059806	0.52	1.28	†	-0.07	0.07	†
	7	R059807	1.20	0.84	†	1.11	-1.11	†
	8	R059808	1.28	0.59	0.31	†	†	†
	9	R059809	0.85	-0.11	†	†	†	†
	10	R059810	1.26	0.24	0.28	†	†	†
R5	1	R058501	1.07	-1.26	0.20	†	†	†
	2	R058502	1.18	-0.66	0.25	†	†	†
	3	R058503	0.63	-1.52	0.11	†	†	†
	4	R058504	0.46	-1.09	†	1.29	-1.29	†
	5	R058505	0.87	-0.21	0.20	†	†	†
	6	R058506	0.92	-0.94	0.20	†	†	†
	7	R058507	0.62	-1.35	0.09	†	†	†
	8	R058508	0.51	-0.88	†	0.48	0.64	-1.12
	9	R058509	0.45	-0.53	†	†	†	†
	10	R058510	0.80	-1.25	0.19	†	†	†
R6	1	R058601	0.92	-1.34	0.13	†	†	†
	2	R058602	0.47	-0.60	†	1.33	-1.33	†
	3	R058603	1.11	-1.11	0.31	†	†	†
	4	R058604	1.24	-0.97	0.22	†	†	†
	5	R058605	0.64	-1.21	0.08	†	†	†
	6	R058606	0.58	-0.40	†	0.33	-0.33	†
	7	R058607	1.07	-0.89	0.27	†	†	†
	8	R058608	0.57	-0.19	†	1.33	-0.44	-0.90
	9	R058609	0.70	-0.67	0.09	†	†	†
	10	R058610	1.02	-1.24	0.26	†	†	†
R9	1	R060501	0.47	-0.78	0.21	†	†	†
	2	R060502	1.34	-1.80	0.26	†	†	†
	3	R060503	0.65	-0.36	†	0.48	-0.48	†
	4	R060504	0.95	-0.79	0.22	†	†	†
	5	R060505	0.57	-0.58	†	0.90	-0.47	-0.42
	6	R060507	0.42	-0.06	†	0.82	-0.82	†
	7	R060508	0.72	0.72	†	1.30	-1.30	†
	8	R060509	0.53	-0.53	†	0.16	-0.16	†
	9	R060510	0.81	-1.11	0.41	†	†	†
	10	R060511	0.85	-0.83	0.36	†	†	†
R10	1	R060601	0.82	-0.31	0.20	†	†	†
	2	R060602	0.53	-1.48	0.15	†	†	†
	3	R060607	0.61	-0.77	†	1.87	-1.87	†
	4	R060604	0.64	-1.40	0.28	†	†	†
	5	R060605	0.68	-0.41	†	1.50	-1.50	†
	6	R060606	0.51	1.50	†	2.32	-1.67	-0.66
	7	R060610	0.90	-0.17	0.21	†	†	†
	8	R060608	0.55	-0.01	†	0.23	-0.23	†
	9	R060609	1.10	-1.10	0.23	†	†	†
	10	R060603	0.60	0.16	†	0.88	-0.88	†

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