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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for the Earth Science Scale, by Block and Item, Grade 8 Science State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the earth science scale, by block and item, grade 8 science state assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S5	0	K040801	0.51	-0.38	0.00	†	†	†
	1	K040802	0.45	-1.95	0.00	-1.04	1.04	†
	1G	K040808	0.59	-0.00	0.00	-1.37	1.37	†
	1M	K040809	0.61	0.59	0.00	-1.47	1.47	†
	2	K040803	0.74	0.11	0.00	†	†	†
	3	K040804	1.27	1.47	0.00	-0.16	0.16	†
	4	K040805	0.63	1.43	0.00	-1.33	1.33	†
	5	K040806	1.09	1.51	0.00	†	†	†
S7	1	K102301	0.36	-0.94	0.00	-1.96	1.96	†
	2	K102101	0.83	0.00	0.19	†	†	†
	3	K102201	0.75	-0.79	0.23	†	†	†
	4	K102001	0.60	-0.45	0.00	†	†	†
	5	K101701	1.87	1.43	0.27	†	†	†
	6	K101801	0.76	0.97	0.00	†	†	†
	7	K101901	0.77	0.04	0.28	†	†	†
	8	K097601	1.04	0.53	0.15	†	†	†
	9	K097801	0.88	1.98	0.28	†	†	†
	10	K097701	0.74	0.28	0.46	†	†	†
	11	K098501	0.60	1.38	0.00	†	†	†
	12	K101301	0.87	0.77	0.31	†	†	†
	13	K101401	1.19	1.92	0.25	†	†	†
	14	K101501	0.69	2.34	0.18	†	†	†
	15	K101601	1.57	1.79	0.18	†	†	†
	16	K101201	0.66	1.89	0.00	-0.58	0.58	†
	17	K101101	0.70	0.00	0.11	†	†	†
	18	K100901	0.76	-0.21	0.25	†	†	†
	19	K101001	1.15	1.61	0.28	†	†	†
	20	K097901	0.28	2.55	0.00	0.75	-0.75	†
S10	3	K094101	0.60	0.75	0.31	†	†	†
	4	K093501	0.56	-0.26	0.15	†	†	†
	6	K092601	0.88	-0.90	0.00	†	†	†
	7	K099701	1.09	1.67	0.47	†	†	†
	12	K102501	0.83	0.25	0.19	†	†	†
	13	K102401	1.07	0.90	0.14	†	†	†
S11	1	K042701	0.89	0.31	0.27	†	†	†
	2	K042702	1.06	0.50	0.22	†	†	†
	3	K042703	1.07	0.60	0.30	†	†	†
	7	K043101	0.59	0.06	0.00	-0.26	0.26	†
	8	K043102	0.43	-0.59	0.00	-0.56	0.56	†
	9	K043103	0.61	1.83	0.00	†	†	†
	11	K043301	1.07	0.69	0.25	†	†	†
S12	3	K047001	0.43	0.93	0.26	†	†	†
	6	K047301	0.92	1.97	0.00	†	†	†
	9	K047601	0.81	2.12	0.10	†	†	†
S13	2	K048301	0.68	-0.39	0.15	†	†	†
	6	K048701	1.02	0.96	0.43	†	†	†
	7	K048801	0.55	1.60	0.19	†	†	†
	13	K049401	0.66	1.97	0.00	1.35	-1.35	†
	14	K049402	0.44	0.42	0.00	0.67	-0.67	†
	15	K0494CL	0.24	2.25	0.00	-3.45	3.53	0.54
S14	7	K036101	0.72	-1.46	0.00	†	†	†
	10	K0364CL	0.54	2.38	0.00	1.66	0.72	-2.38
	11	K036402	0.32	1.83	0.00	0.25	-0.25	†
S15	5	K037401	1.03	2.39	0.00	†	†	†
	7	K037601	0.67	0.52	0.00	0.47	-0.47	†
	10	K037801	0.78	1.09	0.20	†	†	†
	15	K038201	0.41	3.50	0.00	1.22	-1.22	†
S20	3	K093901	0.47	0.27	0.00	0.79	-0.79	†
	5	K090401	0.86	-0.06	0.26	†	†	†
	8	K091101	0.78	0.10	0.27	†	†	†
	9	K093801	1.59	1.84	0.36	†	†	†
	10	K091401	0.94	2.11	0.22	†	†	†
S21	6	K045701	0.51	0.20	0.00	0.61	-0.61	†
	10	K046101	0.83	0.35	0.23	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. 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 or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.

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