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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 8 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 8 U.S. history national main assessment (accommodations permitted [R3]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
H3	1	H035601	1.04	-0.46	0.22	†	†	†	†	†
	2	H035602	1.90	0.56	0.28	†	†	†	†	†
	9	H036201	0.43	-1.52	0.24	†	†	†	†	†
	16	H036702	1.21	-1.84	0.24	†	†	†	†	†
H4	4	H059101	0.88	0.87	0.28	†	†	†	†	†
	7	H059401	1.08	0.40	0.23	†	†	†	†	†
	11	H059801	0.81	0.04	0.00	-0.19	0.19	†	†	†
	14	H060101	1.75	1.28	0.32	†	†	†	†	†
	16	H060301	1.04	-0.02	0.24	†	†	†	†	†
H5	10	H038501	0.89	0.90	0.19	†	†	†	†	†
	11	H038601	0.43	2.33	0.00	0.22	-0.22	†	†	†
	14	H038801	1.17	0.82	0.31	†	†	†	†	†
	15	H038802	0.71	-0.02	0.28	†	†	†	†	†
	16	H038901	1.23	0.89	0.20	†	†	†	†	†
H6	4	H039401	0.68	0.24	0.00	1.53	-1.53	†	†	†
	8	H039801	1.26	0.08	0.21	†	†	†	†	†
H7	1	H057201	0.39	-0.71	0.24	†	†	†	†	†
	2	H057301	0.88	-1.38	0.21	†	†	†	†	†
	6	H057701	0.47	-1.46	0.00	1.18	-1.18	†	†	†
	7	H057801	0.65	0.43	0.00	0.31	-0.31	†	†	†
	8	H057901	0.93	-1.06	0.24	†	†	†	†	†
H8	2	H034201	0.95	0.63	0.32	†	†	†	†	†
	3	H034301	0.66	-0.69	0.23	†	†	†	†	†
	6	H034601	0.53	-0.66	0.25	†	†	†	†	†
H9	1	H060401	0.84	0.98	0.19	†	†	†	†	†
	2	H060501	0.96	0.69	0.18	†	†	†	†	†
	6	H060901	0.63	-0.41	0.28	†	†	†	†	†
	7	H061001	0.55	0.21	0.22	†	†	†	†	†
	8	H061101	0.58	1.17	0.18	†	†	†	†	†
	10	H061301	0.62	1.14	0.25	†	†	†	†	†
	13	H061601	0.49	0.60	0.00	1.75	-1.75	†	†	†
H11	1	H043201	0.78	-0.02	0.00	1.05	-1.05	†	†	†
	2	H043301	0.96	0.58	0.24	†	†	†	†	†
	3	H043401	0.69	0.03	0.00	0.45	-0.45	†	†	†
	4	H043501	0.61	-0.07	0.00	†	†	†	†	†
	5	H043601	0.59	0.59	0.00	-0.20	0.20	†	†	†
	6	H043701	0.47	0.42	0.00	-0.32	0.32	†	†	†
	7	H043702	1.24	1.19	0.16	†	†	†	†	†
	8	H043703	1.74	0.30	0.25	†	†	†	†	†
	9	H043704	1.03	1.54	0.21	†	†	†	†	†
	10	H043705	0.70	1.61	0.00	†	†	†	†	†
	11	H043801	1.22	-0.34	0.29	†	†	†	†	†
	12	H043901	0.74	-0.88	0.26	†	†	†	†	†
	13	H044001	0.54	1.29	0.00	0.78	0.14	-0.91	†	†
† 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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