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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 Physical Science Scale, by Block and Item, Grade 8 Science National Main Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the physical 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
S3	1	K040601	0.64	-0.10	0.00	†	†	†	†
	2	K0406CL	0.70	0.89	0.00	-0.00	0.00	†	†
	3	K040603	0.64	-0.61	0.00	†	†	†	†
	4	K040604	0.79	0.13	0.00	†	†	†	†
	5	K040605	0.47	0.54	0.00	0.43	-0.43	†	†
	6	K040606	0.90	-0.26	0.00	1.76	-1.76	†	†
S6	6	K031309	0.29	-2.71	0.00	-4.65	2.12	2.53	†
	7	K031302	0.47	1.04	0.00	†	†	†	†
	8	K031305	0.71	1.67	0.00	†	†	†	†
	9	K031306	0.58	3.18	0.00	†	†	†	†
S10	9	K095901	0.58	1.41	0.00	1.23	-1.23	†	†
	10	K093601	0.77	1.74	0.00	0.56	-0.56	†	†
	11	K095301	1.14	0.78	0.47	†	†	†	†
	14	K095101	0.75	0.71	0.24	†	†	†	†
	15	K095801	0.61	1.21	0.00	†	†	†	†
	16	K095501	0.98	1.53	0.12	†	†	†	†
S11	4	K042801	1.04	1.26	0.18	†	†	†	†
	5	K042901	1.70	1.81	0.25	†	†	†	†
	10	K043201	0.36	0.25	0.26	†	†	†	†
	13	K043501	0.62	-0.03	0.00	1.36	-1.36	†	†
	14	K043601	0.76	-0.04	0.00	†	†	†	†
	15	K043602	0.54	2.92	0.00	-0.54	0.54	†	†
	16	K043603	0.72	-0.99	0.00	†	†	†	†
S12	1	K046801	0.46	0.59	0.29	†	†	†	†
	2	K046901	0.96	0.42	0.26	†	†	†	†
	4	K047101	1.24	0.23	0.21	†	†	†	†
	5	K047201	0.53	0.38	0.00	0.23	-1.19	0.95	†
	7	K047401	0.62	0.97	0.00	-0.40	0.40	†	†
	12	K047901	0.95	0.32	0.00	†	†	†	†
S13	1	K048201	1.27	0.73	0.19	†	†	†	†
	4	K048501	1.06	1.10	0.32	†	†	†	†
	5	K048601	0.54	1.02	0.00	1.07	-1.07	†	†
	9	K049001	0.65	3.24	0.00	-1.97	1.97	†	†
	10	K049101	0.63	-0.28	0.17	†	†	†	†
S14	1	K035401	0.76	1.55	0.44	†	†	†	†
	3	K035601	0.29	0.76	0.00	†	†	†	†
	4	K035701	0.86	0.64	0.19	†	†	†	†
	5	K035801	0.56	-0.57	0.00	-0.33	0.33	†	†
	8	K036201	0.85	0.53	0.12	†	†	†	†
	9	K036301	0.50	0.36	0.00	-1.67	1.67	†	†
	13	K036601	0.53	-0.25	0.18	†	†	†	†
	16	K036901	0.70	-0.36	0.18	†	†	†	†
S15	4	K037301	0.38	1.06	0.00	-2.24	2.24	†	†
	6	K037501	0.74	2.09	0.00	-0.24	0.24	†	†
	8	K037701	0.32	-3.04	0.00	0.29	1.48	-1.77	†
	9	K037703	0.47	0.73	0.00	0.39	-0.39	†	†
	11	K037901	0.95	2.04	0.22	†	†	†	†
	16	K038301	0.77	1.32	0.00	2.25	0.82	-1.04	-2.03
S20	2	K094001	0.36	1.46	0.23	†	†	†	†
	4	K096001	0.60	0.12	0.26	†	†	†	†
	6	K095601	1.00	-0.07	0.21	†	†	†	†
	7	K095401	0.47	2.79	0.00	0.88	-0.88	†	†
	11	K096201	0.88	1.63	0.26	†	†	†	†
	14	K095201	0.66	0.68	0.21	†	†	†	†
	15	K093701	0.59	1.13	0.00	0.67	-0.67	†	†
	16	K097001	0.29	2.80	0.00	0.37	-0.37	†	†
S21	3	K045401	1.15	0.40	0.57	†	†	†	†
	4	K045501	0.80	0.90	0.29	†	†	†	†
	7	K045801	0.58	1.29	0.00	1.62	-1.62	†	†
	8	K045901	0.73	1.09	0.39	†	†	†	†
	11	K046201	0.63	1.82	0.32	†	†	†	†
	14	K046501	0.65	1.23	0.00	0.68	-0.68	†	†
	15	K046601	0.76	-0.03	0.00	†	†	†	†
† 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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