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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 4 Geography National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the environment and society scale, by block and item, grade 4 geography national main assessment (accommodations not permitted [R2]): 2001

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2
† 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	7	G028401	0.40	0.23	†	0.89	-0.89
G3	10	G028701	0.99	0.88	†	0.75	0.18
G3	14	G029101	1.14	0.50	0.46	†	†
G4	3	G008101	1.27	0.10	0.27	†	†
G4	12	G008801	1.25	0.89	0.30	†	†
G4	13	G008901	0.94	-0.34	0.39	†	†
G4	15	G009001	0.48	-0.56	†	1.67	-0.65
G5	4	G009201	0.66	0.82	†	0.57	-0.57
G5	12	G009801	0.76	-1.53	0.30	†	†
G5	13	G009901	0.60	0.33	0.31	†	†
G6	2	G029801	0.65	-1.32	0.30	†	†
G6	5	G030101	0.63	1.47	†	0.29	-0.29
G6	9	G030501	0.53	0.44	†	-0.18	0.70
G7	10	G032401	0.60	0.20	†	0.12	-0.12
G8	5	G012302	1.27	1.52	0.24	†	†
G8	12	G012801	0.56	-0.39	0.31	†	†
G8	17	G013201	0.84	1.48	†	-0.03	0.03

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