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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Reading Assessment IRT Parameters → IRT Parameters for Items in the Reading for Literary Experience Scale, Grade 4 Reading Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience scale, grade 4 reading combined national and state main assessment, by item and block: 2007

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), 2007 Reading Assessment.
R3	1	R053601	1.40	-0.90	0.25	†	†	†
	2	R053701	0.82	-1.38	0.21	†	†	†
	3	R053801	0.98	-1.06	0.26	†	†	†
	4	R053901	0.74	0.39	†	1.16	-1.16	†
	5	R054001	0.66	-0.59	†	1.61	-1.61	†
	6	R054101	0.82	0.03	0.31	†	†	†
	7	R054201	0.61	-0.01	†	1.00	0.03	-1.03
	8	R054301	0.67	0.82	†	1.22	-1.22	†
	9	R054401	1.05	-0.67	0.30	†	†	†
	10	R054501	0.61	-0.48	0.31	†	†	†
R4	1	R052901	1.18	-1.35	0.38	†	†	†
	2	R052902	0.91	-0.25	0.27	†	†	†
	3	R052903	1.51	-0.33	0.24	†	†	†
	4	R052904	0.63	-0.43	†	-0.14	0.14	†
	5	R052905	1.78	-0.32	0.26	†	†	†
	6	R052906	0.84	-0.36	†	†	†	†
	7	R052907	0.64	-0.21	†	1.36	-0.19	-1.17
	8	R052908	1.48	-0.50	0.24	†	†	†
	9	R052909	0.84	-0.87	†	†	†	†
	10	R052910	1.24	-0.47	0.30	†	†	†
R5	1	R012601	0.74	0.88	†	†	†	†
	2	R012602	1.25	1.17	0.17	†	†	†
	3	R012603	1.33	-0.13	0.19	†	†	†
	4	R012604	1.02	1.05	†	†	†	†
	5	R012605	0.69	0.95	0.26	†	†	†
	6	R012606	1.46	0.25	0.34	†	†	†
	7	R012607	0.81	1.20	†	1.06	-0.29	-0.77
	8	R012608	0.47	-1.29	0.24	†	†	†
	9	R012609	0.99	0.79	0.27	†	†	†
	10	R012610	1.45	0.29	0.34	†	†	†
	11	R012612	0.57	0.54	†	†	†	†
R9	1	R053001	0.58	-2.30	0.11	†	†	†
	2	R053002	1.38	-0.91	0.38	†	†	†
	3	R053003	0.96	-0.85	†	†	†	†
	4	R053004	0.60	-0.78	†	0.46	-0.46	†
	5	R053005	0.63	-1.13	0.17	†	†	†
	6	R053006	0.42	-0.18	†	0.05	-0.21	0.15
	7	R053007	0.68	-2.04	0.09	†	†	†
	8	R053008	0.77	-1.37	0.23	†	†	†
	9	R053009	0.65	-1.35	†	†	†	†
	10	R053010	0.59	-1.84	†	†	†	†
R11	1	R021601	0.50	-1.77	0.13	†	†	†
	2	R020401	0.76	-2.08	†	†	†	†
	3	R020601	1.36	-1.54	0.19	†	†	†
	4	R021101	0.51	-1.76	0.04	†	†	†
	5	R020701	0.89	-0.93	†	†	†	†
	6	R020501	0.94	0.24	0.12	†	†	†
	7	R022101	1.43	-1.16	0.18	†	†	†
	8	R021701	0.44	0.41	†	1.37	-1.37	†
	9	R022201	1.14	-1.69	0.29	†	†	†
	10	R021201	0.35	-1.28	†	0.11	-0.11	†

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