NAEP Analysis and Scaling - IRT Parameters for Items in the Reading to Perform a Task Scale, by Block and Item, Grade 8 Reading National Main Assessment: 2005

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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 8 Reading Combined National and State Main Assessment: 2005

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: 2005
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3
† 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, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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, d_ji 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	0.81	-2.70	0.00	†	†	†
	2	R053302	1.36	0.14	0.17	†	†	†
	3	R053303	0.79	-0.10	0.00	†	†	†
	4	R053304	1.06	-1.61	0.38	†	†	†
	5	R053305	0.72	-0.03	†	-0.25	0.25	†
	6	R053306	1.40	0.19	0.18	†	†	†
	7	R053307	1.71	-0.52	0.27	†	†	†
	8	R053308	1.40	-0.24	0.24	†	†	†
	9	R053309	0.36	0.43	†	-0.73	0.73	†
R10	1	R013401	1.01	0.17	0.18	†	†	†
	2	R013402	0.90	-0.14	0.00	†	†	†
	3	R013403	0.45	0.49	†	-2.24	2.24	†
	4	R013404	1.08	-0.28	0.36	†	†	†
	5	R013405	0.93	-0.27	0.00	†	†	†
	6	R013406	0.62	0.49	0.00	†	†	†
	7	R013407	0.64	-0.21	0.00	†	†	†
	8	R013408	0.57	-0.09	0.21	†	†	†
	9	R013409	0.77	-0.27	0.00	†	†	†
	10	R013410	0.89	-0.36	0.31	†	†	†
	11	R013411	0.49	-0.99	0.00	†	†	†
	12	R013413	0.49	0.03	0.00	†	†	†
R11	1	R013001	0.86	-1.10	0.00	†	†	†
	2	R013002	1.71	-0.59	0.20	†	†	†
	3	R013003	0.96	-0.56	0.00	†	†	†
	4	R013004	0.36	0.84	†	-0.05	0.05	†
	5	R013005	0.79	-1.06	0.00	†	†	†
	6	R013006	1.06	-0.28	0.26	†	†	†
	7	R013007	0.56	-1.65	0.00	†	†	†
	8	R013008	0.68	0.13	0.00	†	†	†
	9	R013009	0.90	-1.13	0.00	†	†	†
	10	R013010	0.84	-1.04	0.00	†	†	†
	11	R013011	0.52	-0.43	0.00	†	†	†
	12	R013012	0.97	-0.30	0.24	†	†	†
R15	1	R028301	0.72	-1.96	0.19	†	†	†
	2	R028401	0.41	-1.24	†	0.03	-0.03	†
	3	R028501	0.54	-1.30	†	0.75	-0.75	†
	4	R029501	1.26	-0.42	0.21	†	†	†
	5	R029701	1.07	-1.73	0.31	†	†	†
	6	R028801	0.28	-1.80	†	1.53	-1.09	-0.44
	7	R029001	0.88	-1.00	0.39	†	†	†
	8	R029901	0.92	-0.08	0.22	†	†	†
	9	R029601	0.36	-1.78	†	1.78	-1.78	†
	10	R029801	0.90	-1.91	0.19	†	†	†

Last updated 27 July 2009 (JL)

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