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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 12 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the gathering of interactions of peoples, cultures, and ideas scale, by block and item, grade 12 U.S. history national main assessment (accommodations not permitted [R2]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
H3	2	H044201	0.97	0.65	0.23	†	†	†	†	†
	3	H044301	0.58	0.90	0.00	1.47	0.52	-1.99	†	†
	6	H044601	0.55	-0.77	0.26	†	†	†	†	†
	13	H045101	0.76	0.72	0.33	†	†	†	†	†
	14	H045102	0.92	0.64	0.00	0.77	-0.77	†	†	†
	16	H045301	0.51	1.28	0.00	-1.83	1.83	†	†	†
H4	1	H045501	0.71	0.56	0.00	2.22	-0.16	-2.06	†	†
	7	H046101	0.25	2.48	0.00	†	†	†	†	†
H5	2	H062101	0.90	2.57	0.17	†	†	†	†	†
	15	H063401	0.63	-0.17	0.00	1.08	0.03	-1.11	†	†
H6	5	H049001	0.50	0.50	0.34	†	†	†	†	†
	8	H049201	1.09	1.25	0.18	†	†	†	†	†
	9	H049301	1.06	0.86	0.30	†	†	†	†	†
	11	H049501	0.97	-0.90	0.29	†	†	†	†	†
	12	H049502	1.07	0.84	0.27	†	†	†	†	†
	13	H049503	0.89	1.48	0.00	0.59	-0.59	†	†	†
H7	3	H050201	0.72	0.45	0.00	1.86	-1.86	†	†	†
	4	H050202	0.86	1.09	0.14	†	†	†	†	†
	5	H050203	1.70	1.81	0.25	†	†	†	†	†
	11	H050801	0.86	0.02	0.29	†	†	†	†	†
	15	H051101	1.33	-0.13	0.00	†	†	†	†	†
	16	H051102	0.89	0.03	0.00	0.30	-0.30	†	†	†
H8	1	H051301	0.73	1.14	0.00	0.55	-0.55	†	†	†
	5	H051701	1.58	1.29	0.18	†	†	†	†	†
	6	H051801	1.31	0.26	0.31	†	†	†	†	†
	7	H051901	1.60	0.52	0.15	†	†	†	†	†
H9	1	H060401	0.83	0.58	0.23	†	†	†	†	†
	2	H060501	0.73	0.03	0.25	†	†	†	†	†
	6	H060901	0.66	-0.58	0.32	†	†	†	†	†
	7	H061001	0.68	0.88	0.35	†	†	†	†	†
	8	H061101	0.81	1.35	0.33	†	†	†	†	†
	10	H061301	1.81	0.69	0.31	†	†	†	†	†
	13	H061601	0.43	-0.52	0.00	1.55	-1.55	†	†	†
H11	13	H065001	1.36	-0.23	0.30	†	†	†	†	†
	14	H065101	0.80	0.84	0.00	0.72	-0.72	†	†	†
	15	H065201	0.75	0.43	0.00	0.76	-0.76	†	†	†
	16	H065301	0.72	0.35	0.00	0.77	-0.77	†	†	†
	17	H065401	0.60	0.47	0.00	1.05	-0.72	-0.33	†	†
† 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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