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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 to Perform a Task Scale, Grade 8 Reading Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the reading to perform a task scale, grade 8 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.
R10	1	R013401	1.09	0.20	0.20	†	†	†
	2	R013402	0.94	-0.16	†	†	†	†
	3	R013403	0.44	0.53	†	-2.24	2.24	†
	4	R013404	1.04	-0.41	0.32	†	†	†
	5	R013405	0.96	-0.22	†	†	†	†
	6	R013406	0.60	0.52	†	†	†	†
	7	R013407	0.67	-0.07	†	†	†	†
	8	R013408	0.56	-0.24	0.18	†	†	†
	9	R013409	0.75	-0.21	†	†	†	†
	10	R013410	1.02	-0.18	0.37	†	†	†
	11	R013411	0.47	-1.06	†	†	†	†
	12	R013413	0.46	0.09	†	†	†	†
R11	1	R013001	0.74	-1.15	†	†	†	†
	2	R013002	1.67	-0.63	0.20	†	†	†
	3	R013003	0.94	-0.57	†	†	†	†
	4	R013004	0.31	1.05	†	-0.14	0.14	†
	5	R013005	0.72	-1.04	†	†	†	†
	6	R013006	1.09	-0.27	0.26	†	†	†
	7	R013007	0.53	-1.78	†	†	†	†
	8	R013008	0.65	0.25	†	†	†	†
	9	R013009	0.86	-1.08	†	†	†	†
	10	R013010	0.84	-1.01	†	†	†	†
	11	R013011	0.53	-0.47	†	†	†	†
	12	R013012	0.93	-0.32	0.23	†	†	†
R15	1	R028301	0.77	-1.92	0.17	†	†	†
	2	R028401	0.41	-1.23	†	-0.01	0.01	†
	3	R028501	0.55	-1.32	†	0.74	-0.74	†
	4	R029501	1.33	-0.37	0.23	†	†	†
	5	R029701	1.02	-1.89	0.24	†	†	†
	6	R028801	0.28	-1.70	†	1.63	-1.24	-0.38
	7	R029001	0.82	-1.12	0.34	†	†	†
	8	R029901	0.93	-0.09	0.23	†	†	†
	9	R029601	0.34	-1.80	†	1.21	-1.21	†
	10	R029801	0.95	-1.86	0.24	†	†	†

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