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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 8 Science Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the earth science scale, by block and item, grade 8 science combined national and state main assessment: 2005

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. # Rounds to zero. 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	5	K090401	0.86	-0.14	0.25	†	†	†	†
	8	K091101	0.92	0.26	0.30	†	†	†	†
	10	K091401	1.34	2.07	0.25	†	†	†	†
	9	K093801	1.99	1.82	0.39	†	†	†	†
	3	K093901	0.49	0.30	†	0.81	-0.81	†	†
S5	0	K040801	0.68	-0.97	0.00	†	†	†	†
	1	K040802	0.54	-2.00	†	-0.92	0.92	†	†
	2	K040803	0.82	-0.05	0.00	†	†	†	†
	3	K040804	1.80	1.04	0.00	†	†	†	†
	4	K040805	0.68	1.22	†	-1.37	1.37	†	†
	5	K040806	1.16	1.21	0.00	†	†	†	†
	1	K040808	0.58	-0.13	†	-1.44	1.44	†	†
	1	K040809	0.62	0.42	†	-1.43	1.43	†	†
S7	5	K097601	1.00	0.34	0.14	†	†	†	†
	7	K097701	0.66	#	0.43	†	†	†	†
	6	K097801	0.77	1.88	0.30	†	†	†	†
	17	K097901	0.26	2.70	†	0.43	-0.43	†	†
	8	K098501	0.61	1.53	0.00	†	†	†	†
	15	K100901	0.83	-0.29	0.28	†	†	†	†
	16	K101001	1.07	1.38	0.26	†	†	†	†
	14	K101101	0.69	-0.16	0.13	†	†	†	†
	13	K101201	0.61	1.97	†	-0.62	0.62	†	†
	9	K101301	0.98	0.77	0.33	†	†	†	†
	10	K101401	1.30	1.67	0.28	†	†	†	†
	11	K101501	0.85	2.01	0.18	†	†	†	†
	12	K101601	1.60	1.71	0.17	†	†	†	†
	4	K102001	0.54	-0.58	0.00	†	†	†	†
	2	K102101	0.81	-0.24	0.17	†	†	†	†
	3	K102201	0.75	-1.05	0.20	†	†	†	†
	1	K102301	0.34	-1.28	†	-2.03	2.03	†	†
S10	6	K092601	0.77	-0.96	0.00	†	†	†	†
	4	K093501	0.56	-0.19	0.14	†	†	†	†
	3	K094101	0.69	0.76	0.31	†	†	†	†
	7	K099701	1.32	1.76	0.45	†	†	†	†
	12	K102401	1.13	0.82	0.15	†	†	†	†
	11	K102501	0.82	0.24	0.16	†	†	†	†
S11	3	K047001	0.32	1.24	0.20	†	†	†	†
	6	K047301	1.12	1.94	0.00	†	†	†	†
	9	K047601	0.94	1.99	0.10	†	†	†	†
S12	2	K048301	0.66	-0.32	0.19	†	†	†	†
	6	K048701	0.93	1.07	0.44	†	†	†	†
	7	K048801	0.77	1.94	0.25	†	†	†	†
	12	K049401	0.71	2.15	†	1.40	-1.40	†	†
	13	K049402	0.45	0.48	†	0.55	-0.55	†	†
	14	K0494CL	0.20	2.10	†	-6.18	3.81	1.22	1.15
S13	7	K036101	0.68	-1.53	0.00	†	†	†	†
	11	K036402	0.34	2.00	†	0.21	-0.21	†	†
	10	K0364CL	0.56	2.08	†	1.34	0.50	-1.83	†
S14	5	K037401	0.99	2.62	†	†	†	†	†
	6	K037601	0.72	0.73	†	0.45	-0.45	†	†
	9	K037801	0.78	1.20	0.18	†	†	†	†
	14	K038201	0.45	2.77	†	0.60	-0.60	†	†
S15	6	K064101	0.47	1.86	†	0.66	-0.32	-0.34	†
	7	K064201	0.70	-0.48	0.24	†	†	†	†
	9	K064401	0.57	3.12	0.24	†	†	†	†
	12	K064701	0.05	9.51	0.12	†	†	†	†
S16	1	K065101	0.29	0.06	0.23	†	†	†	†
	2	K065201	0.87	1.30	0.34	†	†	†	†
	7	K065701	1.39	1.38	0.30	†	†	†	†
	8	K065801	0.67	0.72	0.15	†	†	†	†
	12	K066101	0.32	-0.89	†	0.35	-0.35	†	†
S17	1	K066401	0.86	0.78	0.36	†	†	†	†
	2	K066501	0.93	-0.38	0.30	†	†	†	†
	5	K066801	0.53	-0.29	0.27	†	†	†	†
	7	K067001	0.83	1.40	0.23	†	†	†	†
	11	K067401	0.46	0.07	†	0.60	-0.60	†	†
	15	K067801	0.67	-0.32	0.14	†	†	†	†
S18	2	K068301	1.43	1.62	0.48	†	†	†	†
	9	K069001	0.50	1.60	0.15	†	†	†	†
	15	K069601	0.71	0.98	0.21	†	†	†	†

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