NAEP Analysis and Scaling - IRT Parameters for Items in the Physical Science Scale, by Block and Item, Grade 12 Science National Main Assessment: 2005

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Science Assessment Item Response Theory Parameters → IRT Parameters for items in the Physical Science Scale, by Block and Item, Grade 12 Science National Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the physical science scale, by block and item, grade 12 science national main assessment: 2005
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3
† Not applicable; c parameters are not estimated for generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models. 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. For item j, d_ji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005 Science Assessment.
S3	2	K049501	0.28	-3.18	†	-2.21	-3.13	5.34
	4	K049502	0.36	2.29	†	-0.72	0.52	0.21
	5	K049503	0.86	-0.35	0.00	†	†	†
S4	1	K096601	0.73	-1.39	0.26	†	†	†
	3	K102601	1.48	0.91	0.24	†	†	†
	4	K102701	0.21	-2.16	0.28	†	†	†
	7	K093401	1.92	0.51	0.23	†	†	†
	12	K093201	0.70	0.33	0.23	†	†	†
	13	K096501	1.30	1.78	†	-0.06	0.06	†
	15	K096401	2.07	1.64	0.07	†	†	†
S6	1	K049701	0.38	-0.25	†	-1.54	1.54	†
	2	K049702	0.69	-0.96	0.00	†	†	†
	3	K049708	1.25	0.06	0.00	†	†	†
	4	K049703	1.12	1.52	0.00	†	†	†
	5	K049704	1.07	-0.63	†	0.83	-0.83	†
	6	K049705	0.75	-0.12	†	-0.59	0.59	†
	7	K049706	1.35	0.13	0.00	†	†	†
	8	K049707	1.28	0.93	†	0.87	-0.87	†
S7	1	K105101	0.80	-0.54	0.34	†	†	†
	2	K105701	1.50	1.22	0.33	†	†	†
	5	K105301	1.45	1.28	0.20	†	†	†
	7	K105501	1.10	1.79	†	0.16	-0.16	†
S10	3	K095701	0.18	2.22	0.29	†	†	†
	8	K096301	0.51	0.78	0.22	†	†	†
	9	K096701	0.59	0.79	0.22	†	†	†
	10	K093301	0.31	1.69	0.30	†	†	†
	11	K098601	0.59	2.26	†	1.03	-1.03	†
	12	K093101	0.55	0.87	0.31	†	†	†
	14	K096801	0.90	2.39	0.29	†	†	†
S11	1	K046801	0.62	-0.24	0.27	†	†	†
	2	K046901	1.08	-0.06	0.32	†	†	†
	4	K047101	1.17	-0.51	0.22	†	†	†
	5	K047201	0.52	-0.02	†	-1.37	1.37	†
	7	K047401	0.58	0.55	†	-0.51	0.51	†
	12	K047901	1.25	-0.38	0.00	†	†	†
	14	K105901	1.28	0.34	0.24	†	†	†
	15	K059501	2.12	1.93	0.13	†	†	†
S12	1	K048201	1.48	-0.40	0.22	†	†	†
	4	K048501	0.98	0.07	0.25	†	†	†
	5	K048601	0.52	0.09	†	1.07	-1.07	†
	9	K049001	1.41	1.89	0.00	†	†	†
	10	K049101	0.61	-0.72	0.19	†	†	†
S13	1	K058601	0.65	-0.68	0.24	†	†	†
	5	K059001	0.55	-2.49	0.00	†	†	†
	6	K059101	0.56	1.34	0.00	†	†	†
S14	1	K052601	1.02	0.20	0.25	†	†	†
	2	K052701	0.91	1.12	0.24	†	†	†
	7	K053201	1.48	1.19	0.12	†	†	†
	8	K053301	1.85	0.85	0.17	†	†	†
	9	K053401	0.68	0.66	0.28	†	†	†
S16	1	K071801	1.22	1.01	0.46	†	†	†
	2	K071901	1.20	1.62	0.27	†	†	†
	3	K072001	0.34	0.55	0.26	†	†	†
	4	K072101	1.07	0.00	0.20	†	†	†
	5	K072201	0.53	0.57	†	-0.47	0.47	†
	10	K072601	0.60	-0.48	†	1.95	-1.95	†
	11	K072701	0.98	0.76	0.24	†	†	†
	12	K072801	1.38	0.55	0.16	†	†	†
	13	K072901	1.74	1.43	0.24	†	†	†
S17	1	K073001	0.70	-0.11	0.23	†	†	†
	3	K073201	0.67	0.02	0.21	†	†	†
	4	K073301	0.84	-0.39	0.27	†	†	†
	8	K073401	0.84	0.08	0.34	†	†	†
	9	K073501	0.71	1.53	†	0.37	0.36	-0.73
	11	K073701	0.58	0.23	0.24	†	†	†
	12	K073801	0.57	1.44	†	0.42	-0.42	†
	14	K073901	0.86	0.89	0.30	†	†	†
	15	K074001	1.42	1.15	0.34	†	†	†
S18	2	K074201	1.24	1.54	0.17	†	†	†
	4	K074301	0.63	1.30	†	-0.67	0.67	†
	6	K074401	1.04	0.33	0.25	†	†	†
	7	K074501	0.52	0.37	†	-0.75	0.75	†
	8	K074601	0.80	0.47	†	0.42	-0.42	†
	10	K074701	0.38	3.04	0.20	†	†	†
	12	K074801	0.49	0.74	†	-0.32	0.61	-0.29
	13	K074901	1.15	0.93	0.21	†	†	†

Last updated 27 July 2009 (JL)

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