NAEP Analysis and Scaling - IRT Parameters for the Physical Science Scale, by Block and Item, Grade 8 Science State Assessment (Accommodations Permitted [R3]): 2000

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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 State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the physical science scale, by block and item, grade 8 science state assessment (accommodations permitted [R3]): 2000
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3
S3	1	K040601	0.62	-0.05	0.00	†	†	†
	2	K0406CL	0.68	0.93	0.00	-0.08	0.08	†
	3	K040603	0.66	-0.72	0.00	†	†	†
	4	K040604	0.66	0.08	0.00	†	†	†
	5	K040605	0.44	0.59	0.00	0.22	-0.22	†
	6	K040606	0.90	-0.22	0.00	1.77	-1.77	†
S6	6	K031309	0.26	-2.68	0.00	-5.42	2.68	2.74
	7	K031302	0.66	0.93	0.00	†	†	†
	8	K031305	0.83	1.49	0.00	†	†	†
	9	K031306	0.65	2.93	0.00	†	†	†
S10	9	K095901	0.60	1.29	0.00	1.13	-1.13	†
	10	K093601	0.83	1.76	0.00	0.50	-0.50	†
	11	K095301	0.76	0.56	0.41	†	†	†
	14	K095101	1.01	0.82	0.29	†	†	†
	15	K095801	0.62	1.33	0.00	†	†	†
	16	K095501	1.57	1.44	0.15	†	†	†
S11	4	K042801	0.98	1.16	0.16	†	†	†
	5	K042901	2.55	1.63	0.26	†	†	†
	10	K043201	0.38	0.16	0.21	†	†	†
	13	K043501	0.67	0.00	0.00	1.33	-1.33	†
	14	K043601	0.84	-0.09	0.00	†	†	†
	15	K043602	0.53	2.84	0.00	-0.59	0.59	†
	16	K043603	0.68	-0.89	0.00	†	†	†
S12	1	K046801	0.53	0.50	0.23	†	†	†
	2	K046901	0.98	0.44	0.25	†	†	†
	4	K047101	1.18	0.21	0.18	†	†	†
	5	K047201	0.49	0.38	0.00	0.14	-1.24	1.10
	7	K047401	0.63	0.87	0.00	-0.47	0.47	†
	12	K047901	1.01	0.33	0.00	†	†	†
S13	1	K048201	1.27	0.72	0.19	†	†	†
	4	K048501	1.11	1.13	0.30	†	†	†
	5	K048601	0.53	1.03	0.00	1.14	-1.14	†
	9	K049001	0.71	2.96	0.00	-1.46	1.46	†
	10	K049101	0.62	-0.36	0.12	†	†	†
S14	1	K035401	1.24	1.38	0.46	†	†	†
	3	K035601	0.28	0.78	0.00	†	†	†
	4	K035701	1.18	0.64	0.21	†	†	†
	5	K035801	0.59	-0.52	0.00	-0.30	0.30	†
	8	K036201	1.10	0.56	0.16	†	†	†
	9	K036301	0.61	0.40	0.00	-1.29	1.29	†
	13	K036601	0.55	-0.35	0.10	†	†	†
	16	K036901	0.82	-0.41	0.12	†	†	†
S15	4	K037301	0.43	0.97	0.00	-2.12	2.12	†
	6	K037501	0.81	1.92	0.00	-0.31	0.31	†
	8	K037701	0.36	-2.63	0.00	-0.35	1.91	-1.56
	9	K037703	0.49	0.68	0.00	0.25	-0.25	†
	11	K037901	0.96	1.79	0.17	†	†	†
	16	K038301	0.91	1.32	0.00	2.02	0.87	-0.79
S20	2	K094001	0.35	1.55	0.24	†	†	†
	4	K096001	0.67	0.41	0.28	†	†	†
	6	K095601	1.26	0.08	0.24	†	†	†
	7	K095401	0.56	2.71	0.00	0.94	-0.94	†
	11	K096201	0.99	1.34	0.25	†	†	†
	14	K095201	0.76	0.78	0.23	†	†	†
	15	K093701	0.61	1.11	0.00	0.57	-0.57	†
	16	K097001	0.28	3.11	0.00	0.67	-0.67	†
S21	3	K045401	1.35	0.50	0.57	†	†	†
	4	K045501	0.67	0.80	0.27	†	†	†
	7	K045801	0.62	1.17	0.00	1.54	-1.54	†
	8	K045901	1.37	1.21	0.43	†	†	†
	11	K046201	0.85	1.83	0.34	†	†	†
	14	K046501	0.72	1.18	0.00	0.68	-0.68	†
	15	K046601	0.82	0.20	0.00	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji 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.

Last updated 15 July 2008 (KL)

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