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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 State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the physical science scale, by block and item, grade 4 science state assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S4	1	K031101	0.55	-1.48	0.00	†	†	†
	2	K031102	0.48	-1.09	0.00	†	†	†
	3	K031103	0.44	-0.14	0.00	†	†	†
	4	K031104	0.43	-2.59	0.00	†	†	†
	5	K031105	0.77	2.75	0.00	†	†	†
	6	K031106	0.77	2.12	0.16	†	†	†
	7	K031107	0.69	1.46	0.00	-0.05	0.05	†
S6	6	K031309	1.03	-0.56	0.00	†	†	†
	7	K031302	0.54	3.38	0.00	0.86	-0.86	†
	8	K031303	0.85	-0.13	0.00	0.49	-0.49	†
	9	K031304	0.52	-0.73	0.00	0.53	-0.53	†
S10	4	K032001	0.40	0.38	0.00	0.96	-0.96	†
	5	K032101	1.12	0.39	0.28	†	†	†
S11	3	K097501	0.74	0.74	0.28	†	†	†
	7	K098301	0.69	1.22	0.00	1.95	-1.95	†
	8	K097101	0.50	0.96	0.24	†	†	†
	10	K098201	0.28	0.63	0.00	†	†	†
	12	K097401	0.58	1.67	0.09	†	†	†
S12	5	K034001	0.60	1.95	0.00	-0.32	0.32	†
	7	K034201	1.07	0.19	0.20	†	†	†
	8	K034301	0.88	0.20	0.18	†	†	†
S13	3	K034801	1.42	0.73	0.30	†	†	†
	4	K034802	0.70	0.15	0.00	†	†	†
	5	K034901	0.32	-1.82	0.00	0.02	-0.02	†
	6	K034902	0.58	0.81	0.00	-0.34	0.34	†
S14	1	K035401	0.55	2.71	0.38	†	†	†
	3	K035601	0.31	3.52	0.00	1.71	-1.71	†
	4	K035701	1.09	1.36	0.25	†	†	†
	5	K035801	0.56	0.73	0.00	-0.17	0.17	†
	9	K036201	1.25	1.55	0.13	†	†	†
	10	K036301	0.61	1.54	0.00	-0.95	0.95	†
S15	4	K037301	0.44	2.09	0.00	-2.19	2.19	†
	6	K037501	0.86	2.91	0.00	-0.39	0.39	†
	8	K037701	0.35	-1.55	0.00	1.47	0.71	-2.18
	9	K037702	0.71	1.34	0.00	0.15	-0.15	†
S20	5	K096901	0.51	0.96	0.00	-1.22	1.22	†
	6	K097201	0.84	0.89	0.17	†	†	†
	9	K098401	0.57	1.71	0.00	0.69	-0.69	†
	10	K100801	0.85	0.67	0.40	†	†	†
	11	K100701	0.51	0.90	0.00	-1.50	1.50	†
	14	K097301	1.20	1.21	0.23	†	†	†
S21	1	K039501	1.00	-0.33	0.26	†	†	†
	3	K039701	0.71	2.44	0.30	†	†	†
	6	K040001	0.44	0.82	0.00	-0.57	0.57	†
	7	K040101	1.28	0.03	0.27	†	†	†
	9	K040301	0.25	2.51	0.00	0.26	-0.26	†
† 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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