NAEP Analysis and Scaling - IRT Parameters for the Economic and Technological Changes and Their Relation to Society, Ideas, and the Environment Scale, by Block and Item, Grade 12 U.S. History National Main Assessment (Accommodations Permitted [R3]):

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Economic and Technological Changes and Their Relation to Society, Ideas, and the Environment Scale, by Block and Item, Grade 12 U.S. History National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the economic and technological changes and their relation to society, ideas, and the environment scale, by block and item, grade 12 U.S. history national main assessment (accommodations permitted [R3]): 2001
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
H3	1	H044101	0.85	1.35	0.25	†	†	†	†	†
	9	H044801	1.04	0.84	0.20	†	†	†	†	†
	11	H044902	0.85	0.24	0.23	†	†	†	†	†
H4	2	H045601	0.67	-0.21	0.22	†	†	†	†	†
	4	H045801	1.38	0.19	0.25	†	†	†	†	†
	8	H046201	0.80	0.07	0.23	†	†	†	†	†
H5	1	H062001	0.68	-1.19	0.00	0.65	-0.65	†	†	†
	3	H062201	0.65	0.69	0.00	-0.06	0.06	†	†	†
	8	H062701	1.46	0.42	0.23	†	†	†	†	†
	12	H063101	0.57	0.67	0.00	0.62	-0.62	†	†	†
	13	H063201	1.01	0.20	0.19	†	†	†	†	†
	16	H063501	0.37	-1.57	0.24	†	†	†	†	†
	17	H063601	0.50	0.74	0.00	0.78	-0.78	†	†	†
	18	H063701	0.76	1.63	0.27	†	†	†	†	†
H6	17	H049901	0.53	0.46	0.23	†	†	†	†	†
H7	1	H050001	1.09	-0.58	0.18	†	†	†	†	†
H7	9	H050601	1.24	-0.68	0.19	†	†	†	†	†
H8	9	H052101	0.62	-1.43	0.22	†	†	†	†	†
	10	H052102	0.72	-0.07	0.20	†	†	†	†	†
	12	H052301	0.41	1.10	0.00	1.88	1.22	-3.10	†	†
	15	H052601	0.37	1.48	0.00	1.11	-1.11	†	†	†
H9	5	H060801	0.55	-0.66	0.25	†	†	†	†	†
H9	9	H061201	0.89	1.43	0.27	†	†	†	†	†
H10	3	H042101	0.55	-0.46	0.31	†	†	†	†	†
	4	H042102	0.61	0.40	0.26	†	†	†	†	†
	11	H042701	0.53	-0.88	0.21	†	†	†	†	†
	12	H042702	0.83	-1.24	0.21	†	†	†	†	†
	16	H043001	0.71	0.13	0.00	0.51	-0.51	†	†	†
	17	H043101	0.29	0.61	0.00	1.66	-1.66	†	†	†
H11	Cluster: 5,6	H0642CL	0.48	-0.02	0.00	0.51	-0.51	†	†	†
	7	H064401	0.61	0.99	0.00	0.28	0.13	-0.41	†	†
	8	H064501	0.94	-1.15	0.25	†	†	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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 or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment.

Last updated 15 July 2008 (KL)

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