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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 National Main Assessment (Accommodations Permitted [R3]): 2000

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

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
S5	1	K040801	0.58	-0.17	0.00	†	†	†	†
	1	K040802	0.46	-1.74	0.00	-1.08	1.08	†	†
	1	K040808	0.59	0.00	0.00	-1.44	1.44	†	†
	1	K040809	0.61	0.65	0.00	-1.48	1.48	†	†
	2	K040803	0.70	0.29	0.00	†	†	†	†
	3	K040804	0.99	1.58	0.00	-0.27	0.27	†	†
	4	K040805	0.75	1.44	0.00	-0.93	0.93	†	†
	5	K040806	1.02	1.55	0.00	†	†	†	†
S6	1	K102301	0.37	-1.00	0.00	-2.00	2.00	†	†
	2	K102101	0.88	-0.08	0.17	†	†	†	†
	3	K102201	0.91	-0.49	0.37	†	†	†	†
	4	K102001	0.57	-0.40	0.00	†	†	†	†
	5	K101701	1.84	1.53	0.27	†	†	†	†
	6	K101801	0.69	1.01	0.00	†	†	†	†
	7	K101901	0.89	0.21	0.34	†	†	†	†
	8	K097601	1.04	0.50	0.16	†	†	†	†
	9	K097801	0.56	2.28	0.26	†	†	†	†
	10	K097701	0.50	-0.59	0.25	†	†	†	†
	11	K098501	0.59	1.38	0.00	†	†	†	†
	12	K101301	0.85	0.77	0.27	†	†	†	†
	13	K101401	1.70	1.76	0.26	†	†	†	†
	14	K101501	0.54	2.63	0.18	†	†	†	†
	15	K101601	1.43	1.93	0.18	†	†	†	†
	16	K101201	0.65	1.89	0.00	-0.71	0.71	†	†
	17	K101101	0.85	-0.00	0.18	†	†	†	†
	18	K100901	0.70	-0.28	0.26	†	†	†	†
	19	K101001	0.79	1.86	0.26	†	†	†	†
	20	K097901	0.27	2.55	0.00	0.33	-0.33	†	†
S10	3	K094101	1.12	1.00	0.43	†	†	†	†
	4	K093501	0.58	-0.19	0.21	†	†	†	†
	6	K092601	0.82	-0.90	0.00	†	†	†	†
	7	K099701	0.40	2.16	0.38	†	†	†	†
	12	K102501	0.83	0.31	0.23	†	†	†	†
	13	K102401	1.39	0.79	0.14	†	†	†	†
S11	1	K042701	0.75	0.32	0.26	†	†	†	†
	2	K042702	0.98	0.45	0.18	†	†	†	†
	3	K042703	0.98	0.45	0.27	†	†	†	†
	7	K043101	0.61	0.10	0.00	-0.24	0.24	†	†
	8	K043102	0.42	-0.51	0.00	-0.82	0.82	†	†
	9	K043103	0.72	1.63	0.00	†	†	†	†
	11	K043301	0.88	0.70	0.20	†	†	†	†
S12	3	K047001	0.38	1.43	0.28	†	†	†	†
	6	K047301	0.83	1.93	0.00	†	†	†	†
	9	K047601	1.58	1.78	0.13	†	†	†	†
S13	2	K048301	0.90	-0.22	0.23	†	†	†	†
	6	K048701	0.67	0.93	0.35	†	†	†	†
	7	K048801	0.82	1.70	0.26	†	†	†	†
	13	K049401	0.63	1.88	0.00	1.34	-1.34	†	†
	14	K049402	0.46	0.37	0.00	0.59	-0.59	†	†
	15	K0494CL	0.23	2.35	0.00	-3.80	3.52	1.47	-1.19
S14	7	K036101	0.55	-1.67	0.00	†	†	†	†
	10	K0364CL	0.54	2.47	0.00	1.57	0.67	-2.24	†
	11	K036402	0.32	2.11	0.00	0.46	-0.46	†	†
S15	5	K037401	1.01	2.58	0.00	†	†	†	†
	7	K037601	0.59	0.59	0.00	0.48	-0.48	†	†
	10	K037801	0.76	1.00	0.19	†	†	†	†
	15	K038201	0.41	3.71	0.00	1.68	-1.68	†	†
S20	3	K093901	0.48	0.28	0.00	0.80	-0.80	†	†
	5	K090401	0.91	0.04	0.29	†	†	†	†
	8	K091101	0.94	0.06	0.25	†	†	†	†
	9	K093801	0.42	2.54	0.29	†	†	†	†
	10	K091401	0.82	2.35	0.23	†	†	†	†
S21	6	K045701	0.46	0.17	0.00	0.59	-0.59	†	†
	10	K046101	0.74	0.18	0.16	†	†	†	†
† 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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