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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Science Assessment Item Response Theory Parameters → IRT Parameters for items in the Earth Science Scale, by Block and Item, Grade 12 Science National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the earth science scale, by block and item, grade 12 science national main assessment: 2005

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2
† 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 is 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), 2005 Science Assessment.
S4	2	K094501	0.95	-0.55	0.23	†	†
	5	K100001	0.61	1.63	0.00	†	†
	6	K100101	0.69	0.79	†	0.50	-0.50
	14	K092001	0.66	0.38	†	0.53	-0.53
S5	0	K040801	0.75	-1.78	0.00	†	†
	1	K040802	1.21	-2.38	0.00	†	†
	1	K040808	0.67	-0.94	†	-1.31	1.31
	1	K040809	0.65	-0.33	†	-1.37	1.37
	2	K040803	0.54	-0.45	†	-0.75	0.75
	3	K040804	1.89	0.34	0.00	†	†
	4	K040805	1.47	0.44	0.00	†	†
	5	K040806	1.20	0.63	0.00	†	†
S7	4	K105801	2.18	0.50	0.30	†	†
	6	K105401	0.60	1.75	0.37	†	†
	8	K105601	0.68	1.12	0.00	†	†
	9	K106101	1.47	1.92	†	0.09	-0.09
	10	K104701	0.98	-0.20	0.22	†	†
	11	K105001	0.85	1.12	†	0.37	-0.37
	12	K104801	0.79	0.75	0.23	†	†
	13	K104901	1.22	0.81	0.28	†	†
	16	K104601	0.39	1.45	†	1.70	-1.70
S9	1	K102301	0.37	-1.89	†	-1.32	1.32
	2	K102101	0.71	-0.75	0.26	†	†
	3	K102001	0.72	0.72	†	0.53	-0.53
	4	K101701	1.30	0.64	0.26	†	†
	5	K101801	0.69	-0.25	0.00	†	†
	6	K101901	0.85	-0.30	0.35	†	†
	7	K097601	1.31	0.11	0.20	†	†
	8	K097801	1.02	1.42	0.31	†	†
	9	K097701	0.71	-0.45	0.43	†	†
	10	K098501	0.77	-0.84	0.00	†	†
	11	K101301	1.00	0.27	0.27	†	†
	12	K101401	1.81	1.37	0.30	†	†
	13	K101501	1.27	1.71	0.22	†	†
	14	K101601	2.12	1.27	0.19	†	†
	15	K100901	0.89	-0.99	0.25	†	†
	16	K101001	0.97	0.95	0.28	†	†
	17	K097901	0.49	1.31	0.00	†	†
S10	1	K091901	0.66	-1.35	0.27	†	†
	2	K091001	0.73	-0.61	0.28	†	†
	4	K091801	1.37	1.39	0.20	†	†
	13	K090501	0.51	2.16	†	0.61	-0.61
	15	K094601	1.09	1.68	†	-0.08	0.08
S11	3	K047001	0.72	0.55	0.29	†	†
	6	K047301	0.96	0.02	0.00	†	†
	9	K047601	1.10	1.43	0.11	†	†
S12	2	K048301	0.67	-0.82	0.28	†	†
	6	K048701	0.74	-0.33	0.31	†	†
	7	K048801	1.98	0.96	0.30	†	†
	11	K049401	0.67	1.50	†	1.25	-1.25
	12	K049402	0.33	0.04	†	0.68	-0.68
	13	K0494CL	0.25	0.81	†	-5.88	5.88
S13	2	K058701	0.42	-0.51	0.28	†	†
	4	K058901	1.27	0.47	0.20	†	†
	9	K059701	0.83	0.90	0.23	†	†
	10	K059801	1.21	1.18	0.00	†	†
	11	K059901	0.96	1.28	†	1.16	-1.16
	12	K060001	0.70	1.02	†	†	†
	13	K060101	0.52	2.44	†	0.26	-0.26
S14	3	K052801	0.60	0.58	0.29	†	†
	6	K053001	0.61	2.30	†	1.45	-1.45
	10	K053501	1.41	0.92	0.23	†	†
S16	6	K072301	1.24	0.90	0.17	†	†
	7	K072401	0.88	0.29	0.28	†	†
	8	K072501	1.17	1.42	0.46	†	†
S17	2	K073101	1.16	0.16	0.27	†	†
	5	K091501	0.77	1.72	0.32	†	†
	13	K092101	0.99	1.34	†	-0.11	0.11
S18	1	K074101	0.66	0.89	0.32	†	†
	9	K094801	2.07	1.00	0.19	†	†

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