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 Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the environment and society scale, by block and item, grade 12 geography national main assessment (accommodations not permitted [R2]): 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	0.76	0.67	†	0.39	-0.39	†
G3	8	G021001	0.59	1.70	†	1.14	0.08	-1.23
G3	15	G021602	0.49	1.52	†	0.66	-0.66	†
G3	16	G021701	0.85	0.46	0.16	†	†	†
G3	17	G021702	0.77	-0.26	0.26	†	†	†
G4	2	G038001	0.67	-1.43	0.28	†	†	†
G4	10	G038801	0.67	0.90	†	0.97	-0.25	-0.73
G4	13	G039101	0.85	1.19	0.23	†	†	†
G4	14	G039201	0.63	0.75	0.00	1.21	-1.21	†
G4	15	G039301	0.58	1.13	0.21	†	†	†
G5	7	G016401	0.58	-0.45	†	0.19	-0.19	†
G5	11	G016701	0.58	0.19	0.00	0.74	-0.74	†
G5	14	G017001	1.42	-0.24	0.20	†	†	†
G5	15	G017002	0.67	0.08	0.22	†	†	†
G6	3	G034701	0.68	-0.58	0.27	†	†	†
G6	6	G035001	0.61	0.21	0.00	1.61	-0.38	-1.23
G6	9	G035301	0.63	-0.50	0.00	0.62	-0.07	-0.55
G6	13	G035701	0.81	0.59	0.27	†	†	†
G6	14	G035801	0.43	0.61	0.32	†	†	†
G6	15	G035901	1.01	0.81	0.34	†	†	†
G7	3	G039801	0.59	0.53	0.00	0.98	0.26	-1.24
G7	4	G039901	0.53	-0.78	0.30	†	†	†
G7	10	G040501	0.44	2.18	0.34	†	†	†
G8	6	G025001	0.74	1.44	0.00	0.30	-0.30	†
G8	7	G025101	0.82	0.09	0.00	0.19	-0.19	†
G8	10	G025301	1.07	2.06	0.00	0.45	-0.26	-0.20
G8	16	G025701	1.14	1.32	0.26	†	†	†
G9	4	G026101	0.90	-1.10	0.00	0.15	-0.15	†
G9	9	G026301	0.54	1.93	0.00	0.74	-1.45	0.71
G9	14	G026503	0.67	1.31	0.00	0.62	0.34	-0.97

Printer-friendly Version