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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 4 Science National Main Assessment (Accommodations Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the physical science scale, by block and item, grade 4 science national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S4	1	K031101	0.63	-1.43	0.00	†	†	†
	2	K031102	0.56	-0.95	0.00	†	†	†
	3	K031103	0.51	-0.07	0.00	†	†	†
	4	K031104	0.69	-1.98	0.00	†	†	†
	5	K031105	0.71	2.83	0.00	†	†	†
	6	K031106	0.94	2.10	0.18	†	†	†
	7	K031107	0.62	1.47	0.00	-0.33	0.33	†
S6	6	K031309	0.96	-0.66	0.00	†	†	†
	7	K031302	0.49	3.39	0.00	0.52	-0.52	†
	8	K031303	0.87	-0.26	0.00	0.58	-0.58	†
	9	K031304	0.60	-0.66	0.00	0.49	-0.49	†
S10	4	K032001	0.51	0.23	0.00	1.02	-1.02	†
	5	K032101	0.72	0.20	0.20	†	†	†
S11	3	K097501	0.99	0.72	0.32	†	†	†
	7	K098301	0.60	1.11	0.00	2.17	-2.17	†
	8	K097101	0.54	0.91	0.27	†	†	†
	10	K098201	0.24	0.85	0.00	†	†	†
	12	K097401	1.25	1.28	0.19	†	†	†
S12	5	K034001	0.54	1.92	0.00	-0.15	0.15	†
	7	K034201	0.80	0.06	0.19	†	†	†
	8	K034301	0.79	0.21	0.18	†	†	†
S13	3	K034801	1.07	0.55	0.27	†	†	†
	4	K034802	0.72	0.07	0.00	†	†	†
	5	K034901	0.27	-2.07	0.00	-0.04	0.04	†
	6	K034902	0.56	0.72	0.00	-0.33	0.33	†
S14	1	K035401	0.40	2.44	0.31	†	†	†
	3	K035601	0.30	3.45	0.00	1.57	-1.57	†
	4	K035701	0.80	1.16	0.20	†	†	†
	5	K035801	0.57	0.67	0.00	-0.13	0.13	†
	9	K036201	0.62	1.94	0.09	†	†	†
	10	K036301	0.56	1.48	0.00	-1.11	1.11	†
S15	4	K037301	0.40	2.15	0.00	-2.45	2.45	†
	6	K037501	0.56	4.26	0.00	-0.49	0.49	†
	8	K037701	0.38	-1.39	0.00	1.17	0.96	-2.13
	9	K037702	0.65	1.37	0.00	0.17	-0.17	†
S20	5	K096901	0.48	0.86	0.00	-1.53	1.53	†
	6	K097201	0.84	0.85	0.19	†	†	†
	9	K098401	0.53	1.81	0.00	0.63	-0.63	†
	10	K100801	0.60	0.15	0.27	†	†	†
	11	K100701	0.52	0.88	0.00	-1.40	1.40	†
	14	K097301	0.85	1.08	0.21	†	†	†
S21	1	K039501	1.38	-0.15	0.37	†	†	†
	3	K039701	0.61	1.85	0.22	†	†	†
	6	K040001	0.43	0.78	0.00	-0.63	0.63	†
	7	K040101	1.08	-0.01	0.34	†	†	†
	9	K040301	0.28	2.22	0.00	0.33	-0.33	†
† 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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