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 4 U.S. History National Main Assessment (Accommodations Not Permitted [R2]

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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 4 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 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 4 U.S. history national main assessment (accommodations not permitted [R2]): 2001
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
H3	8	H028701	0.64	-0.22	0.00	1.20	-1.20	†	†	†
	9	H028702	1.22	-0.57	0.00	†	†	†	†	†
	10	H028801	0.55	1.61	0.00	0.61	-0.61	†	†	†
	15	H029201	1.29	0.70	0.33	†	†	†	†	†
H4	2	H054201	0.54	-0.42	0.24	†	†	†	†	†
	3	H054301	0.90	-0.81	0.00	†	†	†	†	†
	4	H054401	0.81	-0.22	0.26	†	†	†	†	†
	5	H054501	1.08	1.15	0.25	†	†	†	†	†
	6	H054601	0.43	0.94	0.00	1.35	-1.35	†	†	†
	10	H055001	1.31	0.47	0.28	†	†	†	†	†
	11	H055101	1.03	0.81	0.18	†	†	†	†	†
	12	H055201	1.51	0.18	0.31	†	†	†	†	†
	13	H055301	0.70	1.03	0.00	0.35	-0.35	†	†	†
H5	11	H056701	0.45	0.07	0.30	†	†	†	†	†
	12	H056801	0.60	-0.19	0.00	1.88	-1.88	†	†	†
	15	H057101	0.81	0.09	0.26	†	†	†	†	†
H6	1	H031601	1.79	1.78	0.23	†	†	†	†	†
	3	H031801	0.50	0.55	0.00	-1.02	1.02	†	†	†
	4	H031802	0.70	0.39	0.00	0.24	-0.24	†	†	†
	9	H032101	0.65	-2.47	0.28	†	†	†	†	†
	11	H032301	0.70	0.77	0.00	0.21	-0.21	†	†	†
	12	H032401	0.54	-2.37	0.30	†	†	†	†	†
H7	3	H057401	0.87	1.63	0.22	†	†	†	†	†
	4	H057501	0.62	0.72	0.00	1.52	-1.52	†	†	†
	12	H058301	0.40	1.96	0.33	†	†	†	†	†
	13	H058401	1.09	0.04	0.34	†	†	†	†	†
	16	H058701	0.56	0.79	0.00	0.75	-0.75	†	†	†
H8	4	H034401	0.79	-0.72	0.00	†	†	†	†	†
	11	H035001	1.00	1.16	0.00	0.09	-0.09	†	†	†
	12	H035002	1.80	0.65	0.30	†	†	†	†	†
	13	H035101	0.75	-0.22	0.00	0.80	-0.80	†	†	†
† 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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