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

NAEP Technical DocumentationIRT parameters for the environment and society scale, by block and item, grade 8 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	10	G013801	2.57	1.22	0.23	†	†	†
G3	12	G014001	1.04	1.21	0.00	-0.01	0.01	†
G3	15	G014301	0.70	0.78	0.00	0.21	-0.21	†
G4	1	G032901	0.40	0.38	0.00	2.06	-2.06	†
G4	3	G033101	1.19	0.66	0.32	†	†	†
G4	5	G033301	0.43	-0.10	0.00	-1.79	1.79	†
G4	6	G033401	0.77	0.50	0.29	†	†	†
G4	8	G033601	0.96	1.31	0.35	†	†	†
G4	10	G033801	0.54	-0.35	0.00	†	†	†
G4	12	G034001	0.90	1.40	0.24	†	†	†
G4	13	G034101	0.51	0.43	0.00	1.45	-1.45	†
G5	7	G016401	0.69	0.17	0.00	0.02	-0.02	†
G5	11	G016701	0.68	0.50	0.00	0.54	-0.54	†
G5	14	G017001	2.06	0.49	0.17	†	†	†
G5	15	G017002	1.06	0.51	0.24	†	†	†
G6	3	G034701	1.18	0.67	0.29	†	†	†
G6	6	G035001	0.68	0.78	0.00	1.67	-0.55	-1.12
G6	9	G035301	0.69	0.27	0.00	0.61	-0.30	-0.31
G6	13	G035701	0.85	1.92	0.23	†	†	†
G6	14	G035801	0.62	1.61	0.32	†	†	†
G6	15	G035901	0.52	1.82	0.30	†	†	†
G7	7	G036701	0.96	0.36	0.24	†	†	†
G7	10	G037001	0.72	1.18	0.30	†	†	†
G8	5	G012302	0.91	0.58	0.21	†	†	†
G8	12	G012801	0.48	-1.87	0.27	†	†	†
G8	17	G013201	0.59	0.26	0.00	-0.04	0.04	†
G9	4	G019003	0.51	0.20	0.00	†	†	†
G9	5	G019101	1.84	0.38	0.36	†	†	†
G9	6	G019102	0.90	1.50	0.00	0.10	-0.10	†
G9	7	G019201	0.63	0.14	0.28	†	†	†
G9	8	G019202	0.82	0.31	0.00	†	†	†
G9	20	G019901	0.31	0.22	0.00	2.35	1.11	-3.46
G9	21	G020001	1.13	2.01	0.00	0.48	-0.48	†
G9	23	G020201	0.64	1.30	0.00	1.58	-1.58	†
G9	Cluster: 24, 25	G0203CL	0.52	0.94	0.00	0.21	-0.19	-0.02

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