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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 Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the physical science scale, by block and item, grade 8 science national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S3	1	K040601	0.63	-0.06	0.00	†	†	†
	2	K0406CL	0.68	0.91	0.00	-0.07	0.07	†
	3	K040603	0.66	-0.74	0.00	†	†	†
	4	K040604	0.69	0.09	0.00	†	†	†
	5	K040605	0.43	0.57	0.00	0.23	-0.23	†
	6	K040606	0.92	-0.24	0.00	1.76	-1.76	†
S6	6	K031309	0.25	-2.83	0.00	-5.76	2.79	2.98
	7	K031302	0.60	0.93	0.00	†	†	†
	8	K031305	0.81	1.50	0.00	†	†	†
	9	K031306	0.64	2.94	0.00	†	†	†
S10	9	K095901	0.57	1.28	0.00	1.18	-1.18	†
	10	K093601	0.80	1.80	0.00	0.53	-0.53	†
	11	K095301	0.76	0.57	0.42	†	†	†
	14	K095101	0.94	0.83	0.29	†	†	†
	15	K095801	0.60	1.32	0.00	†	†	†
	16	K095501	1.44	1.45	0.15	†	†	†
S11	4	K042801	0.96	1.15	0.16	†	†	†
	5	K042901	2.35	1.62	0.25	†	†	†
	10	K043201	0.37	0.16	0.22	†	†	†
	13	K043501	0.66	-0.06	0.00	1.39	-1.39	†
	14	K043601	0.81	-0.14	0.00	†	†	†
	15	K043602	0.50	2.87	0.00	-0.67	0.67	†
	16	K043603	0.65	-0.95	0.00	†	†	†
S12	1	K046801	0.54	0.62	0.27	†	†	†
	2	K046901	0.96	0.39	0.24	†	†	†
	4	K047101	1.13	0.17	0.20	†	†	†
	5	K047201	0.47	0.34	0.00	0.15	-1.31	1.16
	7	K047401	0.60	0.86	0.00	-0.48	0.48	†
	12	K047901	1.00	0.28	0.00	†	†	†
S13	1	K048201	1.21	0.69	0.19	†	†	†
	4	K048501	0.99	1.08	0.28	†	†	†
	5	K048601	0.53	1.00	0.00	1.14	-1.14	†
	9	K049001	0.62	3.18	0.00	-1.70	1.70	†
	10	K049101	0.61	-0.41	0.12	†	†	†
S14	1	K035401	1.23	1.37	0.46	†	†	†
	3	K035601	0.28	0.77	0.00	†	†	†
	4	K035701	1.18	0.62	0.21	†	†	†
	5	K035801	0.57	-0.58	0.00	-0.31	0.31	†
	8	K036201	1.09	0.54	0.17	†	†	†
	9	K036301	0.63	0.37	0.00	-1.23	1.23	†
	13	K036601	0.53	-0.38	0.11	†	†	†
	16	K036901	0.78	-0.47	0.12	†	†	†
S15	4	K037301	0.42	0.97	0.00	-2.14	2.14	†
	6	K037501	0.78	1.95	0.00	-0.30	0.30	†
	8	K037701	0.36	-2.64	0.00	-0.40	1.97	-1.58
	9	K037703	0.50	0.65	0.00	0.27	-0.27	†
	11	K037901	0.90	1.78	0.16	†	†	†
	16	K038301	0.89	1.30	0.00	2.05	0.88	-0.80
S20	2	K094001	0.33	1.48	0.23	†	†	†
	4	K096001	0.56	0.22	0.25	†	†	†
	6	K095601	1.18	0.00	0.22	†	†	†
	7	K095401	0.56	2.69	0.00	0.95	-0.95	†
	11	K096201	0.80	1.31	0.22	†	†	†
	14	K095201	0.73	0.74	0.23	†	†	†
	15	K093701	0.61	1.08	0.00	0.58	-0.58	†
	16	K097001	0.27	3.23	0.00	0.70	-0.70	†
S21	3	K045401	1.29	0.46	0.57	†	†	†
	4	K045501	0.62	0.76	0.26	†	†	†
	7	K045801	0.61	1.14	0.00	1.54	-1.54	†
	8	K045901	1.23	1.19	0.42	†	†	†
	11	K046201	0.83	1.81	0.34	†	†	†
	14	K046501	0.69	1.17	0.00	0.71	-0.71	†
	15	K046601	0.82	0.17	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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