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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 to Perform a Task Scale, by Block and Item, Grade 12 Reading National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the reading to perform a task scale, by block and item, grade 12 reading national 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.
R9	1	R053301	1.11	-3.01	0.00	†	†	†
	2	R053302	1.03	-0.73	0.20	†	†	†
	3	R053303	0.82	-0.68	0.00	†	†	†
	4	R053304	1.07	-2.15	0.23	†	†	†
	5	R053305	0.76	-0.70	†	-0.05	0.05	†
	6	R053306	1.11	-0.45	0.21	†	†	†
	7	R053307	1.82	-0.98	0.28	†	†	†
	8	R053308	1.31	-0.73	0.24	†	†	†
	9	R053309	0.79	0.50	†	†	†	†
R10	1	R013401	0.98	-0.33	0.14	†	†	†
	2	R013402	0.77	-0.82	†	†	†	†
	3	R013403	0.47	-0.17	†	-1.88	1.88	†
	4	R013404	0.79	-1.12	0.27	†	†	†
	5	R013405	1.02	-1.02	0.00	†	†	†
	6	R013406	0.64	0.13	0.00	†	†	†
	7	R013407	0.59	-0.92	0.00	†	†	†
	8	R013408	0.61	-0.56	0.15	†	†	†
	9	R013409	0.68	-1.18	0.00	†	†	†
	10	R013410	0.87	-1.33	0.27	†	†	†
	11	R013411	0.59	-1.52	0.00	†	†	†
	12	R013413	0.50	-0.62	0.00	†	†	†
R11	1	R019301	0.42	0.75	†	0.00	0.00	†
	2	R019401	1.19	0.25	†	0.63	-0.63	†
	3	R019501	0.55	-0.56	0.00	†	†	†
	4	R019601	1.37	0.34	0.16	†	†	†
	5	R019701	0.98	0.39	0.00	†	†	†
	6	R019801	0.71	0.04	0.30	†	†	†
	7	R019901	1.45	-0.04	0.11	†	†	†
	8	R020001	0.50	-0.44	†	0.75	-0.75	†
	9	R020101	0.79	-0.79	0.30	†	†	†
	10	R020201	1.13	-0.42	0.00	†	†	†

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