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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 12 Science National Main Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the physical science scale, by block and item, grade 12 science national main assessment (accommodations permitted [R3]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S3	2	K049501	0.30	-2.76	0.00	-3.24	-2.90	6.14
	4	K049502	0.31	2.77	0.00	-0.72	0.81	-0.09
	5	K049503	0.86	-0.09	0.00	†	†	†
S6	1	K049701	0.41	-0.39	0.00	-1.04	1.04	†
	2	K049702	1.01	-1.16	0.00	†	†	†
	3	K049708	1.21	-0.02	0.00	†	†	†
	4	K049703	1.12	1.58	0.00	†	†	†
	5	K049704	1.17	-0.73	0.00	0.81	-0.81	†
	6	K049705	0.74	-0.10	0.00	-0.73	0.73	†
	7	K049706	1.37	0.16	0.00	†	†	†
	8	K049707	1.05	1.03	0.00	1.02	-1.02	†
S7	1	K105101	0.65	-0.49	0.34	†	†	†
	2	K105701	1.68	1.27	0.31	†	†	†
	5	K105301	2.54	1.39	0.20	†	†	†
	6	K105901	1.07	0.19	0.33	†	†	†
	7	K106001	0.90	3.93	0.09	†	†	†
	9	K105501	1.17	2.00	0.00	0.23	-0.23	†
S9	12	K049914	0.76	0.68	0.00	-1.23	1.23	†
	13	K049912	0.95	1.02	0.00	0.80	-0.80	†
	14	K049913	1.19	0.76	0.11	†	†	†
S10	3	K095701	0.24	1.66	0.28	†	†	†
	8	K096301	0.38	0.66	0.24	†	†	†
	9	K096701	0.67	0.64	0.18	†	†	†
	10	K093301	0.25	1.72	0.29	†	†	†
	11	K098601	0.62	2.07	0.00	0.99	-0.99	†
	13	K093101	1.92	1.20	0.49	†	†	†
	15	K096801	0.83	2.86	0.29	†	†	†
S11	2	K051401	1.26	0.76	0.42	†	†	†
	3	K051501	1.28	1.34	0.33	†	†	†
	7	K051901	1.42	1.87	0.33	†	†	†
	11	K052301	0.38	0.22	0.00	†	†	†
	12	K052401	0.59	1.12	0.00	-0.03	-0.21	0.24
	13	K052402	0.50	3.17	0.00	2.69	-2.69	†
S12	1	K046801	0.84	0.12	0.40	†	†	†
	2	K046901	0.74	-0.49	0.17	†	†	†
	4	K047101	1.09	-0.55	0.19	†	†	†
	5	K047201	0.49	-0.45	0.00	0.60	-1.50	0.90
	7	K047401	0.48	0.43	0.00	-0.75	0.75	†
	12	K047901	1.11	-0.49	0.00	†	†	†
S13	1	K048201	1.50	-0.18	0.20	†	†	†
	4	K048501	1.00	0.35	0.30	†	†	†
	5	K048601	0.52	0.23	0.00	0.99	-0.99	†
	9	K049001	1.35	2.00	0.00	†	†	†
	10	K049101	0.27	-1.06	0.25	†	†	†
S14	1	K052601	0.65	0.02	0.25	†	†	†
	2	K052701	1.01	0.94	0.20	†	†	†
	7	K053101	0.89	1.62	0.00	†	†	†
	8	K053102	0.61	2.67	0.00	†	†	†
	9	K053201	1.51	1.13	0.11	†	†	†
	10	K053301	2.98	0.73	0.20	†	†	†
	11	K053401	0.48	0.33	0.21	†	†	†
S20	1	K096601	0.69	-1.49	0.28	†	†	†
	3	K102601	1.00	0.89	0.21	†	†	†
	4	K102701	0.19	-2.73	0.28	†	†	†
	7	K093401	1.17	0.55	0.23	†	†	†
	14	K093201	0.98	0.46	0.26	†	†	†
	15	K096501	1.16	1.94	0.00	-0.01	0.01	†
	19	K096401	2.39	1.63	0.09	†	†	†
S21	1	K058601	0.72	-0.35	0.30	†	†	†
	5	K059001	0.34	-4.44	0.00	†	†	†
	6	K059101	0.50	1.10	0.00	†	†	†
	10	K059501	2.53	1.91	0.08	†	†	†
† 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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