Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies Scale, by Block and Item, Grade 8 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the change and continuity in American democracy: Ideas, institutions, practices, and controversies scale, by block and item, grade 8 U.S. history national main assessment (accommodations not permitted [R2]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
H3	3	H035701	0.83	1.77	0.24	†	†	†	†	†
	4	H035801	0.61	2.05	0.00	-0.29	0.29	†	†	†
	14	H036601	0.65	1.29	0.14	†	†	†	†	†
H4	1	H058801	0.31	2.83	0.20	†	†	†	†	†
	2	H058901	0.49	2.97	0.25	†	†	†	†	†
	3	H059001	0.79	0.68	0.00	0.06	-0.06	†	†	†
	5	H059201	0.58	0.30	0.00	0.27	-0.27	†	†	†
	6	H059301	0.76	1.12	0.18	†	†	†	†	†
	15	H060201	0.44	0.44	0.00	-0.04	0.04	†	†	†
H5	1	H037901	0.55	0.67	0.24	†	†	†	†	†
	2	H038001	0.90	-1.79	0.21	†	†	†	†	†
	3	H038101	0.99	1.01	0.34	†	†	†	†	†
	4	H038102	1.70	0.73	0.20	†	†	†	†	†
	5	H038103	0.54	1.96	0.00	-1.01	0.40	0.61	†	†
	6	H038201	1.09	0.67	0.17	†	†	†	†	†
	7	H038202	0.72	0.67	0.25	†	†	†	†	†
	17	H039001	0.78	0.98	0.00	0.10	-0.10	†	†	†
H6	2	H039201	0.63	0.40	0.20	†	†	†	†	†
	5	H039501	0.61	0.47	0.21	†	†	†	†	†
	10	H040001	1.05	0.84	0.00	0.96	-0.96	†	†	†
	15	H040301	0.57	1.74	0.20	†	†	†	†	†
	16	H040401	0.66	-1.11	0.24	†	†	†	†	†
H7	5	H057601	0.59	-0.25	0.20	†	†	†	†	†
	9	H058001	0.48	-0.24	0.21	†	†	†	†	†
	10	H058101	0.95	0.31	0.33	†	†	†	†	†
	11	H058201	0.69	0.06	0.22	†	†	†	†	†
	15	H058601	0.34	-0.85	0.00	0.78	-0.78	†	†	†
H8	7	H034701	0.59	-1.09	0.24	†	†	†	†	†
	8	H034702	0.83	1.68	0.00	0.52	-0.52	†	†	†
	9	H034801	0.92	-0.42	0.27	†	†	†	†	†
	10	H034901	0.46	-2.31	0.22	†	†	†	†	†
	15	H035301	0.32	0.19	0.22	†	†	†	†	†
	16	H035401	0.59	-1.35	0.23	†	†	†	†	†
H9	3	H060601	0.57	0.89	0.18	†	†	†	†	†
	4	H060701	0.95	1.73	0.00	0.31	-0.31	†	†	†
	11	H061401	0.67	-0.71	0.23	†	†	†	†	†
	12	H061501	0.60	1.41	0.00	0.12	-0.12	†	†	†
	16	H061901	0.56	0.79	0.19	†	†	†	†	†
H10	2	H042001	0.78	1.43	0.22	†	†	†	†	†
	8	H042501	0.94	1.59	0.16	†	†	†	†	†
	9	H042601	0.53	-0.28	0.23	†	†	†	†	†
	10	H042602	1.18	2.20	0.08	†	†	†	†	†
	13	H042801	1.04	2.00	0.00	†	†	†	†	†
† 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.

Printer-friendly Version