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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: 2002

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: 2002

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2
† 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), 2002 Reading Assessment.
R9	1	R016101	0.55	-0.24	†	0.21	-0.21
	2	R016102	0.87	-1.19	0.05	†	†
	3	R016103	1.34	0.29	0.02	†	†
	4	R016104	0.68	-2.25	0.04	†	†
	5	R016105	1.46	-0.47	0.02	†	†
	6	R016106	0.96	1.23	0.02	†	†
	7	R016107	0.69	-0.21	†	-0.25	0.25
	8	R016108	0.38	-0.18	†	-0.69	0.69
	9	R016109	0.40	0.95	†	1.92	-1.92
R10	1	R013401	0.99	0.13	0.02	†	†
	2	R013402	0.87	-0.03	0.01	†	†
	3	R013403	0.46	0.39	†	-2.17	2.17
	4	R013404	0.97	-0.38	0.03	†	†
	5	R013405	0.82	-0.46	0.01	†	†
	6	R013406	0.58	0.44	0.02	†	†
	7	R013407	0.58	-0.45	0.02	†	†
	8	R013408	0.58	0.03	0.06	†	†
	9	R013409	0.62	-0.49	0.02	†	†
	10	R013410	0.81	-0.33	0.05	†	†
	11	R013411	0.53	-1.26	0.03	†	†
	12	R013412	0.36	-2.64	0.08	†	†
R11	1	R013001	0.90	-1.03	0.02	†	†
	2	R013002	1.70	-0.54	0.02	†	†
	3	R013003	1.00	-0.55	0.01	†	†
	4	R013004	0.38	0.57	†	0.27	-0.27
	5	R013005	0.84	-1.19	0.02	†	†
	6	R013006	1.01	-0.34	0.03	†	†
	7	R013007	0.71	-1.46	0.03	†	†
	8	R013008	0.69	0.07	0.01	†	†
	9	R013009	0.97	-1.19	0.02	†	†
	10	R013010	0.84	-1.05	0.02	†	†
	11	R013011	0.51	-0.02	0.02	†	†
	12	R013012	1.06	-0.31	0.03	†	†

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