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NAEP Technical DocumentationIRT parameters for the market international scale, grade 12 economics national assessment, by item and block: 2012

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
† 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: 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), 2012 Economics Assessment.
E1	2	E429001	0.94	-0.21	0.11	†	†	†	†
	3	E426001	0.42	-1.12	0.15	†	†	†	†
	11	E424001	0.65	1.84	0.19	†	†	†	†
	15	E429301	0.69	-0.01	0.11	†	†	†	†
	20	E422101	0.31	-0.34	0.15	†	†	†	†
E2	14	E421101	0.53	1.75	0.13	†	†	†	†
	15	E422901	0.57	0.01	†	1.41	-1.41	†	†
E3	11	E404501	0.82	1.44	0.17	†	†	†	†
E4	13	E419101	0.66	-0.18	0.15	†	†	†	†
	19	E428201	0.73	0.88	0.14	†	†	†	†
	20	E427701	0.53	0.93	0.17	†	†	†	†
E5	3	E407401	0.37	0.52	0.17	†	†	†	†
	10	E408101	0.49	0.37	0.14	†	†	†	†
E6	7	E409901	0.84	-0.57	0.15	†	†	†	†
	11	E410301	0.49	-0.75	0.16	†	†	†	†
	12	E410401	1.01	2.34	0.08	†	†	†	†
E7	1	E411101	0.57	-1.42	0.15	†	†	†	†
	12	E412201	0.90	0.22	0.18	†	†	†	†
	15	E412501	0.82	-0.63	0.13	†	†	†	†
E8	1	E412901	0.49	-0.86	0.16	†	†	†	†
	10	E413801	0.29	-0.21	0.17	†	†	†	†
E9	2	E415001	0.52	-0.43	0.14	†	†	†	†
	4	E415201	0.37	0.49	†	0.93	-0.93	†	†
	17	E416501	0.81	0.24	0.15	†	†	†	†
	19	E416701	0.95	0.51	0.14	†	†	†	†
E10	9	E417701	0.52	0.60	†	0.90	0.88	0.56	-2.34
	16	E418401	0.75	0.51	0.13	†	†	†	†
	18	E418601	0.26	0.01	0.15	†	†	†	†

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