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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 Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the environment and society scale, by block and item, grade 8 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	10	G013801	2.47	1.23	0.22	†	†	†
G3	12	G014001	1.23	1.05	†	-0.01	0.01	†
G3	15	G014301	0.77	0.75	†	0.09	-0.09	†
G4	1	G032901	0.44	0.39	†	1.85	-1.85	†
G4	3	G033101	1.31	0.63	0.31	†	†	†
G4	5	G033301	0.47	-0.03	†	-1.73	1.73	†
G4	6	G033401	0.85	0.51	0.28	†	†	†
G4	8	G033601	1.08	1.26	0.35	†	†	†
G4	10	G033801	0.52	-0.33	†	†	†	†
G4	12	G034001	1.04	1.44	0.27	†	†	†
G4	13	G034101	0.54	0.42	†	1.38	-1.38	†
G5	7	G016401	0.78	0.17	†	0.02	-0.02	†
G5	11	G016701	0.65	0.51	†	0.57	-0.57	†
G5	14	G017001	2.08	0.42	0.18	†	†	†
G5	15	G017002	1.19	0.58	0.23	†	†	†
G6	3	G034701	1.22	0.63	0.28	†	†	†
G6	6	G035001	0.73	0.76	†	1.57	-0.55	-1.02
G6	9	G035301	0.75	0.27	†	0.59	-0.32	-0.28
G6	13	G035701	0.74	1.97	0.21	†	†	†
G6	14	G035801	0.55	1.36	0.26	†	†	†
G6	15	G035901	0.57	1.58	0.30	†	†	†
G7	7	G036701	1.00	0.33	0.23	†	†	†
G7	10	G037001	0.74	1.06	0.27	†	†	†
G8	5	G012302	0.92	0.68	0.21	†	†	†
G8	12	G012801	0.55	-1.49	0.29	†	†	†
G8	17	G013201	0.70	0.35	†	-0.03	0.03	†
G9	4	G019003	0.53	0.16	†	†	†	†
G9	5	G019101	2.24	0.37	0.36	†	†	†
G9	6	G019102	0.94	1.47	†	0.09	-0.09	†
G9	7	G019201	0.79	0.46	0.37	†	†	†
G9	8	G019202	0.83	0.17	†	†	†	†
G9	20	G019901	0.34	0.20	†	2.28	1.03	-3.31
G9	21	G020001	1.02	2.00	†	0.41	-0.41	†
G9	23	G020201	0.61	1.32	†	1.52	-1.52	†
G9	24	G0203CL	0.66	0.92	†	0.61	-0.61	†

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