NAEP Analysis and Scaling - IRT Parameters for Items in the Reading to Gain Information Scale, by Block and Item, Grade 4 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 Gain Information Scale, by Block and Item, Grade 4 Reading Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, by block and item, grade 4 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.
R6	1	R017301	0.76	-1.02	0.00	†	†	†
	2	R017302	1.55	-0.43	0.26	†	†	†
	3	R017303	0.68	-0.16	†	0.37	-0.37	†
	4	R017304	1.12	-0.12	0.28	†	†	†
	5	R017310	0.54	-0.24	†	-0.63	0.63	†
	6	R017306	0.99	-0.55	0.25	†	†	†
	7	R017307	0.71	1.04	†	1.72	-0.44	-1.28
	8	R017308	1.11	-0.33	0.23	†	†	†
	9	R017309	0.68	-0.70	0.00	†	†	†
R7	1	R012701	1.10	-0.21	0.32	†	†	†
	2	R012702	0.54	-1.40	0.00	†	†	†
	3	R012703	1.06	0.71	0.00	†	†	†
	4	R012704	1.31	0.68	0.14	†	†	†
	5	R012705	1.17	1.38	0.00	†	†	†
	6	R012706	0.54	1.56	0.00	†	†	†
	7	R012707	2.29	0.19	0.28	†	†	†
	8	R012714	0.65	1.75	†	1.35	0.67	-2.03
	9	R012709	0.60	-0.40	0.24	†	†	†
	10	R012710	0.85	0.72	†	†	†	†
R8	1	R017401	0.43	-1.13	†	0.50	-0.50	†
	2	R017501	0.74	0.10	0.33	†	†	†
	3	R017601	1.70	-0.01	0.23	†	†	†
	4	R017701	0.34	1.32	†	0.75	-0.75	†
	5	R017801	1.15	0.48	0.20	†	†	†
	6	R017901	0.57	1.46	†	0.28	-0.28	†
	7	R018001	1.57	-0.17	0.31	†	†	†
	8	R018101	1.71	-0.09	0.21	†	†	†
	9	R018201	0.42	0.73	†	0.78	-0.78	†
	10	R018301	0.50	-0.68	†	-0.44	0.44	†
R10	1	R053101	0.58	-1.55	†	†	†	†
	2	R053102	1.47	-0.04	0.31	†	†	†
	3	R053103	1.62	-0.22	0.21	†	†	†
	4	R053104	0.61	-0.53	0.12	†	†	†
	5	R053105	0.90	0.04	†	0.66	-0.66	†
	6	R053106	0.53	0.46	†	0.05	0.13	-0.18
	7	R053107	1.24	-0.60	0.25	†	†	†
	8	R053108	0.47	-0.38	†	-0.72	0.72	†
	9	R053109	1.51	0.25	0.29	†	†	†
	10	R053110	1.08	1.12	0.32	†	†	†
R12	1	R023301	1.01	-0.80	0.22	†	†	†
	2	R022401	1.16	-0.81	0.40	†	†	†
	3	R023501	0.45	0.12	†	-0.07	0.07	†
	4	R023601	0.72	-0.89	0.00	†	†	†
	5	R023801	1.16	0.13	0.31	†	†	†
	6	R022901	1.33	-0.24	0.21	†	†	†
	7	R024001	0.63	0.91	†	0.91	-0.91	†
	8	R023101	1.33	-0.08	0.18	†	†	†
	9	R024101	1.37	0.36	0.26	†	†	†
	10	R023201	0.50	0.51	0.00	†	†	†

Last updated 27 July 2009 (JL)

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