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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 Space and Place Scale, by Block and Item, Grade 8 Geography National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the space and place 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	1	G013301	0.83	-1.57	0.21	†	†	†
G3	2	G013302	0.47	-1.32	0.23	†	†	†
G3	3	G013401	0.65	-1.27	0.21	†	†	†
G3	7	G013601	0.76	-1.42	0.21	†	†	†
G3	8	G013602	0.64	-0.58	0.20	†	†	†
G3	9	G013701	0.85	-0.19	0.20	†	†	†
G3	13	G014101	1.10	1.27	0.14	†	†	†
G3	16	G014401	0.79	1.24	0.00	1.55	-1.55	†
G3	17	G014501	0.83	1.77	0.27	†	†	†
G4	4	G033201	1.31	0.71	0.32	†	†	†
G4	11	G033901	0.86	0.61	0.27	†	†	†
G4	15	G034301	0.89	1.15	0.30	†	†	†
G4	16	G034401	0.70	-0.07	0.27	†	†	†
G4	1	G016201	0.97	-0.54	0.00	†	†	†
G5	2	G016202	1.05	-0.37	0.22	†	†	†
G5	3	G016203	0.70	-1.03	0.26	†	†	†
G5	4	G016204	1.17	-0.13	0.22	†	†	†
G5	5	G016301	1.12	0.16	0.18	†	†	†
G5	8	G016501	0.66	-0.44	0.18	†	†	†
G5	13	G016901	0.67	0.95	0.29	†	†	†
G6	1	G034501	0.65	-0.52	0.23	†	†	†
G6	11	G035501	0.56	1.71	0.00	0.40	0.12	-0.52
G7	1	G036101	0.80	0.03	0.32	†	†	†
G7	3	G036301	0.85	1.65	0.15	†	†	†
G7	5	G036501	0.69	1.26	0.00	0.31	0.11	-0.42
G7	6	G036601	0.63	-0.17	0.23	†	†	†
G7	9	G036901	0.77	0.01	0.20	†	†	†
G7	11	G037101	0.71	1.16	0.00	0.30	-0.30	†
G7	12	G037201	2.02	0.60	0.28	†	†	†
G7	14	G037401	1.13	1.12	0.21	†	†	†
G8	1	G012201	0.40	-2.08	0.00	-2.35	2.35	†
G8	2	G012202	1.06	-0.61	0.27	†	†	†
G8	3	G012203	0.78	-1.24	0.25	†	†	†
G8	4	G012301	0.70	-1.62	0.25	†	†	†
G8	6	G012401	0.52	-0.41	0.26	†	†	†
G8	10	G012601	0.98	-0.57	0.19	†	†	†
G8	15	G013001	0.52	-0.28	0.00	-1.05	0.73	0.32
G8	16	G013101	0.61	0.37	0.22	†	†	†
G9	1	G018901	1.09	-0.30	0.14	†	†	†
G9	2	G019001	0.74	-2.21	0.25	†	†	†
G9	3	G019002	0.28	0.88	0.00	-6.95	6.95	†
G9	9	G019301	1.04	0.08	0.16	†	†	†
G9	10	G019302	0.52	0.90	0.00	†	†	†
G9	11	G019401	1.44	0.80	0.09	†	†	†
G9	12	G019402	0.58	0.24	0.00	0.11	-0.11	†
G9	13	G019403	0.43	0.67	0.25	†	†	†
G9	14	G019501	0.40	-0.71	0.22	†	†	†
G9	15	G019601	0.76	0.14	0.22	†	†	†
G9	16	G019701	0.43	1.04	0.23	†	†	†
G9	17	G019702	0.71	0.20	0.36	†	†	†
G9	18	G019703	0.84	0.70	0.30	†	†	†
G9	19	G019801	0.71	-0.46	0.23	†	†	†
G9	22	G020101	0.72	0.46	0.21	†	†	†
G9	26	G020401	0.25	-0.21	0.23	†	†	†

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