Table of Contents  |  Search Technical Documentation  |  References

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 8 Science Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the physical science scale, by block and item, grade 8 science combined national and state main assessment: 2005

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
† 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, 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. For item j, dji 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	1	K040601	0.59	-0.30	0.00	†	†	†	†
	3	K040603	0.71	-0.73	0.00	†	†	†	†
	4	K040604	0.71	0.25	0.00	†	†	†	†
	5	K040605	0.47	0.31	†	0.10	-0.10	†	†
	6	K040606	0.96	-0.12	†	1.78	-1.78	†	†
	2	K0406CL	0.68	1.13	†	-0.23	0.23	†	†
S4	15	K093701	0.65	1.09	†	0.62	-0.62	†	†
	2	K094001	0.27	0.80	0.16	†	†	†	†
	14	K095201	0.59	0.59	0.19	†	†	†	†
	7	K095401	0.49	3.10	†	1.15	-1.15	†	†
	6	K095601	1.22	0.31	0.26	†	†	†	†
	4	K096001	0.53	0.03	0.23	†	†	†	†
	11	K096201	0.85	1.33	0.22	†	†	†	†
	16	K097001	0.22	3.00	†	-0.54	0.54	†	†
S6	6	K031301	0.67	-2.60	†	-1.39	0.87	0.52	†
	7	K031302	0.54	1.14	0.00	†	†	†	†
	8	K031305	0.73	1.63	0.00	†	†	†	†
	9	K031306	0.65	2.98	0.00	†	†	†	†
	6	K031309	0.59	-2.16	†	-1.00	1.00	†	†
S10	13	K095101	0.91	0.81	0.28	†	†	†	†
	10	K095301	0.59	0.36	0.37	†	†	†	†
	15	K095501	1.24	1.55	0.13	†	†	†	†
	14	K095801	0.50	1.60	0.00	†	†	†	†
	9	K095901	0.55	1.25	†	1.04	-1.04	†	†
S11	1	K046801	0.56	0.43	0.25	†	†	†	†
	2	K046901	0.97	0.48	0.23	†	†	†	†
	4	K047101	1.18	0.07	0.19	†	†	†	†
	5	K047201	0.53	0.21	†	0.42	-1.17	0.76	†
	7	K047401	0.66	1.01	†	-0.42	0.42	†	†
	12	K047901	0.95	0.26	0.00	†	†	†	†
S12	1	K048201	1.09	0.66	0.16	†	†	†	†
	4	K048501	0.58	1.19	0.25	†	†	†	†
	5	K048601	0.46	1.08	†	1.00	-1.00	†	†
	9	K049101	0.55	-0.31	0.10	†	†	†	†
S13	1	K035401	1.14	1.14	0.44	†	†	†	†
	3	K035601	0.32	0.79	0.00	†	†	†	†
	4	K035701	1.00	0.75	0.22	†	†	†	†
	5	K035801	0.52	-0.60	†	-0.38	0.38	†	†
	8	K036201	1.01	0.63	0.11	†	†	†	†
	9	K036301	0.54	0.39	†	-1.42	1.42	†	†
	13	K036601	0.56	-0.22	0.08	†	†	†	†
	15	K036901	0.77	-0.42	0.11	†	†	†	†
S14	4	K037301	0.39	1.05	†	-1.69	1.69	†	†
	7	K037701	0.41	-2.54	†	0.42	1.53	-1.95	†
	8	K037703	0.46	0.87	†	0.18	-0.18	†	†
	10	K037901	0.88	1.84	0.18	†	†	†	†
	15	K038301	0.69	1.60	†	2.28	1.01	-1.00	-2.29
S15	2	K063701	0.77	0.58	0.24	†	†	†	†
	3	K063801	0.59	1.07	0.31	†	†	†	†
	5	K064001	0.78	0.16	0.23	†	†	†	†
	8	K064301	1.00	-1.56	0.28	†	†	†	†
	11	K064601	0.90	-0.33	0.27	†	†	†	†
	16	K064901	0.94	-0.44	0.21	†	†	†	†
S16	3	K065301	0.79	1.53	0.20	†	†	†	†
	4	K065401	0.65	-0.17	0.27	†	†	†	†
	5	K065501	0.95	0.44	0.19	†	†	†	†
	11	K066001	0.96	1.14	0.16	†	†	†	†
	14	K066301	1.04	0.95	0.08	†	†	†	†
S17	6	K066901	0.67	2.24	0.00	†	†	†	†
	8	K067101	1.18	0.04	0.42	†	†	†	†
	10	K067301	0.74	0.70	0.25	†	†	†	†
S18	1	K068201	0.57	1.07	0.33	†	†	†	†
	6	K068701	0.89	0.13	0.31	†	†	†	†
	12	K069301	0.99	1.69	0.32	†	†	†	†
	13	K069401	0.72	0.67	0.29	†	†	†	†
	16	K069701	0.69	1.67	0.25	†	†	†	†
	18	K069901	0.59	0.79	†	1.14	-1.14	†	†

Printer-friendly Version