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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment Item Response Theory Parameters → Reading Assessment Item Response Theory Parameters → IRT Parameters for the Reading to Perform a Task Scale, by Block and Item, Grade 8 Reading Combined National and State Main Assessment: 2003

NAEP Technical DocumentationIRT parameters for items in the reading to perform a task scale, by block and item, grade 8 reading combined national and state main assessment: 2003

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
R9	1	R016101	0.55	-0.33	†	0.23	-0.23	†
	2	R016102	0.92	-1.09	0.30	†	†	†
	3	R016103	1.35	0.22	0.37	†	†	†
	4	R016104	0.67	-2.26	0.00	†	†	†
	5	R016105	1.41	-0.49	0.26	†	†	†
	6	R016106	0.91	1.28	0.16	†	†	†
	7	R016107	0.70	-0.20	†	-0.23	0.23	†
	8	R016108	0.41	0.17	†	0.12	-0.12	†
	9	R016109	0.40	0.92	†	1.89	-1.89	†
R10	1	R013401	0.97	0.13	0.16	†	†	†
	2	R013402	0.86	-0.09	0.00	†	†	†
	3	R013403	0.45	0.42	†	-2.29	2.29	†
	4	R013404	1.05	-0.26	0.35	†	†	†
	5	R013405	0.86	-0.39	0.00	†	†	†
	6	R013406	0.61	0.48	0.00	†	†	†
	7	R013407	0.61	-0.38	0.00	†	†	†
	8	R013408	0.55	-0.05	0.20	†	†	†
	9	R013409	0.69	-0.42	0.00	†	†	†
	10	R013410	0.82	-0.43	0.28	†	†	†
	11	R013411	0.49	-1.43	0.00	†	†	†
	12	R013413	0.52	-0.06	0.00	†	†	†
R11	1	R013001	0.93	-1.08	0.00	†	†	†
	2	R013002	1.70	-0.57	0.20	†	†	†
	3	R013003	0.98	-0.57	0.00	†	†	†
	4	R013004	0.39	0.63	†	0.18	-0.18	†
	5	R013005	0.83	-1.18	0.00	†	†	†
	6	R013006	1.04	-0.31	0.25	†	†	†
	7	R013007	0.65	-1.50	0.00	†	†	†
	8	R013008	0.69	0.08	0.00	†	†	†
	9	R013009	0.93	-1.18	0.00	†	†	†
	10	R013010	0.83	-1.06	0.00	†	†	†
	11	R013011	0.50	-0.20	0.00	†	†	†
	12	R013012	1.03	-0.33	0.23	†	†	†
R15	1	R028301	0.66	-2.13	0.18	†	†	†
	2	R028401	0.41	-1.28	†	0.14	-0.14	†
	3	R028501	0.52	-1.26	†	0.65	-0.65	†
	4	R029501	1.21	-0.45	0.21	†	†	†
	5	R029701	1.07	-1.77	0.31	†	†	†
	6	R028801	0.28	-1.91	†	1.87	-1.22	-0.65
	7	R029001	0.89	-0.98	0.41	†	†	†
	8	R029901	0.86	-0.09	0.22	†	†	†
	9	R029601	0.36	-1.84	†	1.90	-1.90	†
	10	R029801	0.84	-1.98	0.17	†	†	†
† Not applicable; c parameters are not estimated for generalized partial credit 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), 2003 Reading Assessment.

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