NAEP Analysis and Scaling - IRT Parameters for the Environment and Society Scale, Grade 4 Geography National Assessment, by Item and Block: 2010

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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 4 Geography National Assessment, by Item and Block: 2010

NAEP Technical DocumentationIRT parameters for the environment and society scale, grade 4 geography national assessment, by item and block: 2010
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
† 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, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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, d_ji 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	7	G028401	0.39	0.32	†	1.07	-1.07	†	†	†
	10	G028701	0.82	0.90	†	0.84	0.19	-1.03	†	†
	14	G029101	0.78	0.60	0.44	†	†	†	†	†
G4	3	G008101	1.13	-0.03	0.26	†	†	†	†	†
	12	G008801	0.97	0.94	0.29	†	†	†	†	†
	13	G008901	0.77	-0.71	0.35	†	†	†	†	†
	15	G009001	0.49	-0.41	†	1.79	-0.76	-1.03	†	†
G5	4	G009201	0.55	0.88	†	0.64	-0.64	†	†	†
	13	G009801	0.67	-1.89	0.30	†	†	†	†	†
	14	G009901	0.42	0.32	0.31	†	†	†	†	†
G6	2	G029801	0.56	-1.42	0.30	†	†	†	†	†
	5	G030101	0.62	1.64	†	0.44	-0.44	†	†	†
	9	G030501	0.44	0.26	†	-0.16	0.85	-0.69	†	†
G7	7	G045203	0.65	0.90	†	0.36	-0.36	†	†	†
G8	3	G041701	0.61	0.57	†	0.77	-0.77	†	†	†
	9	G043201	0.89	0.76	†	0.46	-0.46	†	†	†
	12	G041901	0.63	-0.22	0.32	†	†	†	†	†
	13	G042801	0.90	-0.04	0.41	†	†	†	†	†
	14	G042601	0.58	-1.39	†	0.35	-0.35	†	†	†
	16	G043601	1.41	0.44	0.27	†	†	†	†	†

Last updated 30 June 2014 (GF)

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