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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 for Literary Experience Scale, by Block and Item, Grade 8 Reading Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience 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. 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.
R3	1	R017101	1.28	-0.27	0.00	†	†	†
	2	R017102	0.62	0.65	0.00	†	†	†
	3	R017103	0.54	-0.10	0.07	†	†	†
	4	R017104	1.23	0.69	†	0.32	-0.32	†
	5	R017105	0.83	0.93	†	0.81	0.60	-1.41
	6	R017106	0.75	2.01	0.24	†	†	†
	7	R017107	0.49	0.85	†	0.44	-0.44	†
	8	R017108	1.34	1.20	0.00	†	†	†
	9	R017109	0.71	-0.99	0.15	†	†	†
	10	R017110	1.26	0.06	0.00	†	†	†
R4	1	R018401	0.33	-0.92	†	0.83	-0.83	†
	2	R018501	0.66	-1.43	0.17	†	†	†
	3	R018601	0.56	-0.09	†	0.89	-0.89	†
	4	R018701	0.71	0.94	0.00	†	†	†
	5	R018801	0.43	0.54	†	-0.13	0.13	†
	6	R018901	1.25	0.55	0.28	†	†	†
	7	R019001	0.57	-0.07	†	1.79	-0.10	-1.69
	8	R019101	0.62	-0.14	†	0.98	-0.98	†
	9	R019201	0.46	-1.28	0.00	†	†	†
R5	1	R012601	0.91	-0.40	0.00	†	†	†
	2	R012602	1.04	0.25	0.16	†	†	†
	3	R012603	1.27	-0.96	0.21	†	†	†
	4	R012604	0.76	-0.07	0.00	†	†	†
	5	R012605	0.63	-0.07	0.25	†	†	†
	6	R012606	1.76	-0.66	0.34	†	†	†
	7	R012607	0.76	-0.33	†	0.53	-0.53	†
	8	R012608	0.52	-1.99	0.24	†	†	†
	9	R012609	1.26	-0.25	0.27	†	†	†
	10	R012610	1.39	-0.64	0.36	†	†	†
	11	R012612	0.51	-0.37	0.00	†	†	†
R12	1	R053201	0.67	-2.99	0.23	†	†	†
	2	R053202	0.78	-1.21	0.00	†	†	†
	3	R053203	0.44	-0.99	†	0.37	-0.37	†
	4	R053204	1.14	0.04	0.22	†	†	†
	5	R053205	0.64	-0.25	†	0.14	0.35	-0.50
	6	R053206	1.48	-0.06	0.18	†	†	†
	7	R053207	0.95	0.30	†	0.91	-0.91	†
	8	R053208	1.27	-0.85	0.22	†	†	†
	9	R053209	0.57	-0.85	†	0.41	-0.41	†
	10	R053210	0.92	0.12	0.15	†	†	†

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