NAEP Analysis and Scaling - IRT Parameters for the Changing Role of America in the World Scale, by Block and Item, Grade 8 U.S. History National Main Assessment (Accommodations Permitted [R3]): 2001

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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 Changing Role of America in the World Scale, by Block and Item, Grade 8 U.S. History National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the changing role of America in the world scale, by block and item, grade 8 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	7	H036001	1.13	0.26	0.29	†	†	†	†	†
	8	H036101	0.97	-0.61	0.00	†	†	†	†	†
	13	H036501	1.29	0.10	0.22	†	†	†	†	†
H4	13	H060001	1.02	1.80	0.25	†	†	†	†	†
H5	8	H038301	0.85	0.53	0.00	-0.19	0.19	†	†	†
	12	H038701	0.50	-0.64	0.25	†	†	†	†	†
	13	H038702	0.82	1.52	0.00	0.86	-0.86	†	†	†
H6	1	H039101	0.47	0.11	0.31	†	†	†	†	†
	3	H039301	0.80	1.03	0.27	†	†	†	†	†
	6	H039601	1.53	1.16	0.27	†	†	†	†	†
	7	H039701	0.97	1.40	0.26	†	†	†	†	†
H7	14	H058501	0.57	0.65	0.25	†	†	†	†	†
H8	1	H034101	1.04	0.47	0.00	2.56	-0.71	-1.85	†	†
	5	H034501	1.27	0.79	0.00	†	†	†	†	†
	14	H035201	1.04	0.57	0.26	†	†	†	†	†
	17	H035501	0.65	-0.71	0.24	†	†	†	†	†
H9	14	H061701	0.74	1.67	0.17	†	†	†	†	†
H9	15	H061801	0.90	1.55	0.00	1.06	-1.06	†	†	†
H10	1	H041901	0.97	1.45	0.31	†	†	†	†	†
	5	H042201	0.77	2.45	0.00	0.63	-0.63	†	†	†
	6	H042301	0.60	2.75	0.23	†	†	†	†	†
	7	H042401	0.51	2.19	0.20	†	†	†	†	†
	Cluster: 14,15	H0429CL	0.55	0.36	0.00	0.68	-0.30	-0.39	†	†
† 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 14 July 2008 (KL)

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