NAEP Analysis and Scaling - IRT Parameters for Items in the Reading to Gain Information Scale, Grade 4 Reading Combined National and State Main Assessment, by Item and Block: 2007

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Reading Assessment IRT Parameters → IRT Parameters for Items in the Reading to Gain Information Scale, Grade 4 Reading Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the reading to gain information scale, grade 4 reading combined national and state main assessment, by item and block: 2007
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 represents 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), 2007 Reading Assessment.
R6	1	R017301	0.74	-1.16	†	†	†	†
	2	R017302	1.57	-0.47	0.27	†	†	†
	3	R017303	0.64	-0.26	†	0.40	-0.40	†
	4	R017304	1.13	-0.04	0.28	†	†	†
	5	R017310	0.54	-0.27	†	-0.61	0.61	†
	6	R017306	0.98	-0.65	0.26	†	†	†
	7	R017307	0.67	1.03	†	1.80	-0.48	-1.32
	8	R017308	1.07	-0.35	0.22	†	†	†
	9	R017309	0.67	-0.69	†	†	†	†
R7	1	R034501	1.22	0.64	0.29	†	†	†
	2	R034601	0.38	-0.09	†	-0.66	0.66	†
	3	R034701	0.33	-0.62	0.12	†	†	†
	4	R034801	1.35	-0.60	0.28	†	†	†
	5	R034901	0.60	0.89	†	0.88	-0.88	†
	6	R035001	0.62	0.15	†	0.42	-0.42	†
	7	R035101	0.77	0.95	0.19	†	†	†
	8	R035201	1.25	0.83	†	†	†	†
	9	R035301	0.56	1.11	†	1.23	-0.16	-1.07
	10	R035401	0.94	-0.02	0.48	†	†	†
R8	1	R054601	0.88	-0.19	0.31	†	†	†
	2	R054701	1.36	-0.82	0.48	†	†	†
	3	R054801	0.89	-0.14	†	-0.13	0.13	†
	4	R054901	1.38	-0.17	0.30	†	†	†
	5	R055001	1.65	0.13	0.19	†	†	†
	6	R057501	1.18	0.41	0.21	†	†	†
	7	R055101	0.59	0.28	†	0.22	0.53	-0.75
	8	R055201	1.15	-0.74	0.28	†	†	†
	9	R055301	0.58	0.97	†	0.47	-0.47	†
	10	R055401	0.50	0.93	†	0.15	-0.15	†
R10	1	R053101	0.57	-1.65	†	†	†	†
	2	R053102	1.44	-0.04	0.32	†	†	†
	3	R053103	1.65	-0.24	0.22	†	†	†
	4	R053104	0.60	-0.56	0.13	†	†	†
	5	R053105	0.90	-0.01	†	0.69	-0.69	†
	6	R053106	0.51	0.38	†	0.08	0.09	-0.17
	7	R053107	1.25	-0.63	0.26	†	†	†
	8	R053108	0.47	-0.45	†	-0.57	0.57	†
	9	R053109	1.63	0.24	0.30	†	†	†
	10	R053110	0.96	1.12	0.33	†	†	†
R12	1	R023301	1.01	-0.73	0.26	†	†	†
	2	R022401	1.30	-0.67	0.48	†	†	†
	3	R023501	0.45	-0.06	†	-0.01	0.01	†
	4	R023601	0.73	-0.95	†	†	†	†
	5	R023801	1.15	0.01	0.32	†	†	†
	6	R022901	1.32	-0.30	0.22	†	†	†
	7	R024001	0.63	0.80	†	0.84	-0.84	†
	8	R023101	1.40	-0.11	0.20	†	†	†
	9	R024101	1.33	0.31	0.25	†	†	†
	10	R023201	0.54	0.39	†	†	†	†

Last updated 08 January 2010 (JL)

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