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

NAEP Technical DocumentationIRT parameters for the space and place 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	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	G0272CL	0.64	-0.15	†	0.13	0.33	-0.46
G3	2	G027901	0.60	-1.33	0.27	†	†	†
G3	11	G028801	0.97	0.81	0.32	†	†	†
G3	15	G029201	0.72	-0.86	0.33	†	†	†
G4	1	G008001	0.86	-0.43	0.00	†	†	†
G4	2	G008002	1.29	0.82	0.18	†	†	†
G4	4	G008201	0.68	0.00	0.00	†	†	†
G4	5	G008301	1.47	1.07	0.48	†	†	†
G4	6	G008401	0.84	0.85	0.33	†	†	†
G4	7	G008501	1.64	0.73	0.16	†	†	†
G4	8	G008502	1.11	0.79	0.23	†	†	†
G4	10	G008601	0.62	-1.06	0.24	†	†	†
G4	11	G008701	0.76	-0.61	0.00	†	†	†
G4	14	G008902	0.88	-0.68	0.27	†	†	†
G5	1	G009101	0.89	-0.30	0.31	†	†	†
G5	2	G009102	1.15	0.35	0.19	†	†	†
G5	3	G009103	1.08	-0.03	0.30	†	†	†
G5	6	G009401	1.33	0.76	0.13	†	†	†
G5	11	G009601	0.57	-0.21	†	0.02	0.09	-0.11
G6	1	G0293CL	0.75	1.26	†	2.25	0.55	-2.80
G6	10	G030601	2.04	0.67	0.38	†	†	†
G6	11	G030701	1.69	1.29	0.42	†	†	†
G6	12	G0308CL	0.44	1.21	†	-3.20	3.20	†
G6	14	G031301	0.99	0.18	0.29	†	†	†
G7	1	G031501	1.37	1.34	0.24	†	†	†
G7	2	G031601	0.74	-1.56	0.27	†	†	†
G7	3	G031701	1.82	0.86	0.32	†	†	†
G7	4	G031801	1.62	0.30	0.00	†	†	†
G7	5	G031901	0.87	0.62	†	0.22	-0.22	†
G7	6	G032001	1.46	0.06	0.31	†	†	†
G7	7	G032101	1.17	0.71	0.25	†	†	†
G7	8	G032201	1.50	0.82	0.26	†	†	†
G7	9	G032301	1.10	-0.31	0.27	†	†	†
G7	11	G032501	1.88	0.19	0.24	†	†	†
G7	12	G032601	1.24	0.96	†	†	†	†
G7	13	G032701	2.17	0.62	0.22	†	†	†
G7	14	G032801	2.45	0.80	0.23	†	†	†
G8	1	G012201	0.77	-0.83	†	†	†	†
G8	2	G012202	0.97	0.39	0.23	†	†	†
G8	3	G012203	0.85	0.19	0.42	†	†	†
G8	4	G012301	1.33	0.33	0.34	†	†	†
G8	6	G012401	0.51	0.26	0.30	†	†	†
G8	10	G012601	1.64	0.80	0.20	†	†	†
G8	15	G013001	0.64	1.03	†	-0.76	0.99	-0.22
G8	16	G013101	0.86	1.42	0.21	†	†	†

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