Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Estimation of NAEP Scale Scores → NAEP Assessment IRT Parameters → Geography Assessment IRT Parameters → IRT Parameters for the Environment and Society Scale, by Block and Item, Grade 12 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the environment and society scale, by block and item, grade 12 geography national main assessment (accommodations permitted [R3]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† 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 Geography Assessment.
G3	4	G020701	0.68	0.85	†	0.49	-0.49	†
G3	8	G021001	0.58	1.76	†	1.01	0.02	-1.03
G3	15	G021602	0.48	1.68	†	0.67	-0.67	†
G3	16	G021701	0.98	0.42	0.15	†	†	†
G3	17	G021702	0.80	-0.14	0.27	†	†	†
G4	2	G038001	0.78	-1.11	0.32	†	†	†
G4	10	G038801	0.66	0.96	†	0.97	-0.24	-0.73
G4	13	G039101	0.96	1.25	0.25	†	†	†
G4	14	G039201	0.60	0.83	†	1.23	-1.23	†
G4	15	G039301	0.59	1.13	0.20	†	†	†
G5	7	G016401	0.66	-0.33	†	0.21	-0.21	†
G5	11	G016701	0.83	-0.59	†	†	†	†
G5	14	G017001	2.00	-0.18	0.24	†	†	†
G5	15	G017002	0.75	0.17	0.22	†	†	†
G6	3	G034701	0.79	-0.40	0.26	†	†	†
G6	6	G035001	0.64	0.28	†	1.57	-0.34	-1.22
G6	9	G035301	0.63	-0.42	†	0.62	-0.08	-0.54
G6	13	G035701	0.86	0.70	0.28	†	†	†
G6	14	G035801	0.44	0.68	0.33	†	†	†
G6	15	G035901	1.02	0.86	0.33	†	†	†
G7	3	G039801	0.60	0.60	†	0.94	0.28	-1.22
G7	4	G039901	0.55	-0.62	0.32	†	†	†
G7	10	G040501	0.48	2.16	0.35	†	†	†
G8	6	G025001	0.79	1.42	†	0.36	-0.36	†
G8	7	G025101	0.83	0.23	†	0.21	-0.21	†
G8	10	G025301	0.90	2.18	†	0.46	-0.55	0.09
G8	16	G025701	1.48	1.16	0.29	†	†	†
G9	4	G026101	1.07	-1.02	†	0.26	-0.26	†
G9	9	G026301	0.54	1.94	†	0.73	-1.29	0.56
G9	14	G026503	0.70	1.31	†	0.58	0.34	-0.92

Printer-friendly Version