NAEP Analysis and Scaling - IRT Parameters for Items in the Reading for Literary Experience Scale, by Block and Item, Grade 12 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 for Literary Experience Scale, by Block and Item, Grade 12 Reading National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the reading for literary experience scale, by block and item, grade 12 reading national 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.
R3	1	R017101	1.24	-0.78	0.00	†	†	†
	2	R017102	0.68	0.32	†	0.05	-0.05	†
	3	R017103	0.58	-0.58	0.14	†	†	†
	4	R017104	1.00	0.06	†	0.14	-0.14	†
	5	R017105	0.78	0.90	†	0.74	-0.74	†
	6	R017106	0.57	0.44	0.16	†	†	†
	7	R017107	0.49	0.34	†	0.66	-0.66	†
	8	R017108	1.31	0.48	0.00	†	†	†
	9	R017109	0.70	-1.17	0.16	†	†	†
	10	R017110	1.06	-0.52	0.00	†	†	†
R4	1	R013501	0.96	-0.06	0.00	†	†	†
	2	R013502	1.70	-0.37	0.27	†	†	†
	3	R013503	0.52	0.21	0.00	†	†	†
	4	R013504	0.78	-0.25	0.18	†	†	†
	5	R013505	0.68	-0.72	0.00	†	†	†
	6	R013506	0.81	1.28	0.00	†	†	†
	7	R013507	0.95	0.15	0.14	†	†	†
	8	R013508	0.32	0.92	0.00	†	†	†
	9	R013509	0.87	0.85	0.00	†	†	†
R5	1	R016301	0.60	-1.03	0.00	†	†	†
	2	R016302	0.46	0.17	†	1.18	-1.18	†
	3	R016303	0.68	0.80	†	0.71	-0.71	†
	4	R016304	1.28	-0.05	0.33	†	†	†
	5	R016305	0.33	-0.50	†	0.07	-0.07	†
	6	R016306	0.62	0.62	†	0.17	-0.17	†
	7	R016307	0.71	1.09	†	1.17	-1.17	†
	8	R016308	0.47	2.20	†	0.91	0.57	-1.49

Last updated 27 July 2009 (JL)

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