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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 4 Science Combined National and State Main Assessment: 2005

NAEP Technical DocumentationIRT parameters for items in the physical science scale, by block and item, grade 4 science combined national and state main assessment: 2005

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
† 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.
S4	1	K031101	0.51	-2.54	0.00	†	†	†
	2	K031102	0.29	-1.62	0.00	†	†	†
	3	K031103	0.25	0.19	0.00	†	†	†
	4	K031104	0.29	-3.49	0.00	†	†	†
	5	K031105	0.62	3.48	0.00	†	†	†
	6	K031106	0.83	2.11	0.18	†	†	†
	7	K031107	0.46	1.80	†	-0.42	0.42	†
S5	5	K096901	0.44	0.90	†	-1.30	1.30	†
	6	K097201	0.55	0.76	0.11	†	†	†
	14	K097301	0.88	1.02	0.19	†	†	†
	9	K098401	0.45	2.31	†	0.97	-0.97	†
	11	K100701	0.44	0.64	†	-1.84	1.84	†
	10	K100801	1.19	0.69	0.51	†	†	†
S6	6	K031301	0.83	-1.19	†	-0.56	0.48	0.08
	7	K031302	0.46	3.53	†	0.23	-0.23	†
	8	K031303	0.67	0.55	0.00	†	†	†
	9	K031304	0.37	-1.03	†	0.40	-0.40	†
	6	K031309	1.85	-0.63	0.00	†	†	†
S10	4	K032001	0.35	0.02	†	1.04	-1.04	†
	5	K032101	0.94	0.03	0.23	†	†	†
	12	K060401	0.58	0.92	†	0.80	-0.80	†
	13	K060501	0.98	0.89	0.22	†	†	†
	14	K060601	0.89	0.50	0.18	†	†	†
S11	8	K097101	0.54	0.69	0.23	†	†	†
	12	K097401	0.45	1.72	0.08	†	†	†
	3	K097501	0.70	0.63	0.30	†	†	†
	10	K098201	0.16	1.63	0.00	†	†	†
	7	K098301	0.56	0.95	†	1.93	-1.93	†
S12	3	K034801	0.94	0.62	0.25	†	†	†
	4	K034802	0.58	0.29	0.00	†	†	†
	5	K034901	0.28	-1.12	0.00	†	†	†
	6	K034902	0.39	1.15	†	-0.70	0.70	†
S13	1	K035401	0.74	2.61	0.42	†	†	†
	3	K035601	0.35	2.92	†	1.05	-1.05	†
	4	K035701	0.87	1.46	0.24	†	†	†
	5	K035801	0.52	0.64	†	-0.25	0.25	†
	9	K036201	1.16	1.72	0.11	†	†	†
	10	K036301	0.58	1.76	†	-1.05	1.05	†
S14	4	K037301	0.38	2.19	†	-2.28	2.28	†
	7	K037701	0.32	-1.46	†	1.49	0.91	-2.41
	8	K037702	0.57	1.46	†	-0.03	0.03	†
	9	K061401	1.22	2.41	0.05	†	†	†
	12	K061701	0.96	-0.03	0.38	†	†	†
S15	4	K062201	0.39	0.09	†	0.82	-0.82	†
	6	K062401	0.25	1.11	0.00	†	†	†

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