NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Geography Assessment IRT Parameters → IRT Parameters for the Environment and Society Scale, Grade 8 Geography National Assessment, by Item and Block: 2010

NAEP Technical DocumentationIRT parameters for the environment and society scale, grade 8 geography national assessment, by item and block: 2010

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4	dj5
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models. NOTE: Single overall scale. 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 represents the category threshold parameter for category i. The c parameter value is exactly zero for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010 Geography Assessment.
G3	10	G013801	2.15	1.26	0.22	†	†	†	†	†
	12	G014001	1.05	1.17	†	-0.04	0.04	†	†	†
	15	G014301	0.73	0.87	†	0.17	-0.17	†	†	†
G4	1	G032901	0.43	0.40	†	1.90	-1.90	†	†	†
	3	G033101	1.00	0.87	0.32	†	†	†	†	†
	5	G033301	0.49	-0.10	†	-1.24	1.24	†	†	†
	6	G033401	1.09	0.60	0.32	†	†	†	†	†
	8	G059701	2.11	1.24	0.32	†	†	†	†	†
	10	G033801	0.59	-0.39	†	†	†	†	†	†
	12	G034001	1.74	1.37	0.28	†	†	†	†	†
	13	G034101	0.55	0.48	†	1.53	-1.53	†	†	†
G5	10	G050801	0.97	0.41	†	0.05	-0.05	†	†	†
	14	G050301	0.74	0.80	†	1.57	-0.07	-1.51	†	†
G6	3	G034701	1.13	0.59	0.27	†	†	†	†	†
	6	G035001	0.72	0.76	†	1.54	-0.54	-1.00	†	†
	9	G035301	0.73	0.28	†	0.73	-0.38	-0.35	†	†
	13	G035701	0.90	1.83	0.24	†	†	†	†	†
	14	G035801	0.83	1.56	0.24	†	†	†	†	†
	15	G035901	0.70	1.67	0.33	†	†	†	†	†
G7	9	G052401	0.86	0.30	0.28	†	†	†	†	†
G8	5	G049401	0.51	0.54	†	0.14	-0.14	†	†	†
	10	G046301	0.38	0.45	†	0.12	1.83	-1.96	†	†
G9	4	G019003	0.46	0.36	†	†	†	†	†	†
	5	G019101	2.29	0.42	0.37	†	†	†	†	†
	6	G019102	0.97	1.41	†	0.13	-0.13	†	†	†
	7	G019201	0.83	0.36	0.33	†	†	†	†	†
	8	G019202	0.83	0.17	†	†	†	†	†	†
	20	G019901	0.27	0.30	†	3.02	1.15	-4.17	†	†
	21	G020001	0.87	2.22	†	0.39	-0.39	†	†	†
	23	G020201	0.58	1.35	†	1.55	-1.55	†	†	†
	25	G0203CL	0.75	0.72	†	0.98	-0.98	†	†	†

Printer-friendly Version