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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 12 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

NAEP Technical DocumentationIRT parameters for the space and place scale, by block and item, grade 12 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	2	G020601	0.66	-0.32	0.20	†	†	†
G3	3	G020602	0.36	2.50	0.22	†	†	†
G3	5	G020801	0.89	-0.25	0.25	†	†	†
G3	9	G021101	0.41	-1.16	0.25	†	†	†
G3	12	G021401	0.78	-0.30	†	-0.27	0.45	-0.18
G3	14	G021601	0.82	1.78	†	-0.14	0.46	-0.32
G4	5	G038301	0.95	0.41	0.20	†	†	†
G4	6	G038401	0.55	0.89	†	0.85	-0.85	†
G4	9	G038701	0.81	0.05	0.24	†	†	†
G4	12	G039001	0.54	-0.56	0.24	†	†	†
G4	16	G039401	1.12	0.42	0.22	†	†	†
G5	1	G016201	0.51	-1.28	†	-1.22	1.22	†
G5	2	G016202	1.03	-1.07	0.21	†	†	†
G5	3	G016203	0.57	-1.81	0.25	†	†	†
G5	4	G016204	1.19	-1.18	0.25	†	†	†
G5	5	G016301	1.24	-0.60	0.30	†	†	†
G5	8	G016501	0.56	-1.09	0.22	†	†	†
G5	13	G016901	0.65	0.33	0.26	†	†	†
G6	1	G034501	0.53	-0.98	0.24	†	†	†
G6	11	G035501	0.62	0.99	†	0.31	0.08	-0.39
G7	1	G039601	0.64	0.16	0.24	†	†	†
G7	2	G039701	1.11	0.72	0.19	†	†	†
G7	5	G040001	0.53	1.10	†	0.11	0.14	-0.25
G7	9	G040401	0.85	0.53	0.25	†	†	†
G7	11	G040601	0.63	-0.18	0.25	†	†	†
G7	12	G040701	0.70	1.66	†	0.61	-0.61	†
G7	15	G041001	1.03	0.70	0.21	†	†	†
G8	1	G024701	2.03	0.96	0.24	†	†	†
G8	3	G024901	1.71	1.81	0.11	†	†	†
G8	4	G024902	1.13	1.21	0.31	†	†	†
G8	5	G024903	0.84	-0.04	0.37	†	†	†
G8	11	G025401	1.35	0.41	0.19	†	†	†
G9	1	G025901	1.02	0.87	0.23	†	†	†
G9	2	G026001	1.23	0.83	0.20	†	†	†
G9	3	G026002	0.58	0.78	0.24	†	†	†
G9	5	G026201	1.53	0.11	0.39	†	†	†
G9	6	G026202	0.69	0.07	0.21	†	†	†
G9	7	G026203	1.03	-0.68	0.26	†	†	†
G9	8	G026204	0.98	0.01	†	†	†	†
G9	10	G026401	2.02	1.73	0.12	†	†	†
G9	11	G026402	1.34	1.14	0.21	†	†	†
G9	12	G026501	1.50	-1.05	0.29	†	†	†
G9	13	G026502	0.89	-0.16	†	†	†	†
G9	15	G026601	0.87	1.45	†	0.29	-0.29	†
G9	16	G026701	0.68	-0.83	0.32	†	†	†
G9	17	G026702	1.12	0.32	0.22	†	†	†
G9	18	G026801	1.05	-1.19	0.22	†	†	†
G9	19	G026802	1.15	0.99	0.18	†	†	†
G9	20	G026803	0.50	0.98	0.29	†	†	†
G9	21	G026901	0.89	1.23	†	†	†	†
G9	22	G027001	0.52	-1.99	0.22	†	†	†

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