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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 Gathering of Interactions of Peoples, Cultures, and Ideas Scale, by Block and Item, Grade 4 U.S. History National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the gathering of interactions of peoples, cultures, and ideas scale, by block and item, grade 4 U.S. history national main assessment (accommodations permitted [R3]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
H3	2	H028301	0.91	2.81	0.18	†	†	†
	3	H028302	0.89	-0.50	0.21	†	†	†
	4	H028401	0.39	0.85	0.25	†	†	†
	12	H029001	1.70	1.11	0.14	†	†	†
	13	H029002	0.51	0.45	0.00	0.84	-0.84	†
H4	1	H054101	1.15	1.50	0.20	†	†	†
	9	H054901	0.61	0.57	0.00	0.29	-0.29	†
H5	1	H055701	0.95	1.01	0.28	†	†	†
	2	H055801	0.75	0.93	0.17	†	†	†
	3	H055901	0.63	-0.07	0.00	0.66	-0.66	†
	5	H056101	0.94	0.91	0.00	-0.22	0.22	†
	8	H056401	0.61	-0.77	0.00	0.80	-0.80	†
	10	H056601	0.90	0.46	0.00	1.03	-1.03	†
	13	H056901	0.67	0.46	0.16	†	†	†
	14	H057001	1.02	0.48	0.28	†	†	†
H6	2	H031701	0.42	1.19	0.00	-0.77	2.64	-1.86
	5	H031901	0.53	2.24	0.26	†	†	†
	6	H031902	1.43	0.82	0.28	†	†	†
H7	1	H057201	0.53	0.60	0.21	†	†	†
	2	H057301	0.90	-0.11	0.17	†	†	†
	6	H057701	0.54	-0.20	0.00	1.18	-1.18	†
	7	H057801	0.53	1.94	0.00	0.38	-0.38	†
	8	H057901	0.75	0.51	0.23	†	†	†
H8	2	H034201	0.68	1.66	0.31	†	†	†
	3	H034301	1.02	1.36	0.31	†	†	†
	6	H034601	0.59	0.99	0.25	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji 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.

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