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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 Earth Science Scale, by Block and Item, Grade 4 Science State Assessment (Accommodations Permitted [R3]): 2000

NAEP Technical DocumentationIRT parameters for the earth 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
S7	1	K031401	0.31	3.12	0.00	2.48	-0.12	-2.37
	2	K031402	0.67	1.12	0.00	†	†	†
	3	K031403	0.77	-0.37	0.00	0.56	-0.56	†
	4	K031404	1.04	-0.28	0.00	†	†	†
	5	K031405	1.46	1.88	0.19	†	†	†
	6	K031406	0.86	0.71	0.46	†	†	†
	7	K031407	0.40	-0.86	0.00	†	†	†
	8	K031408	0.65	0.11	0.00	0.54	-0.54	†
	9	K031409	0.89	0.18	0.00	†	†	†
	10	K031410	0.42	0.68	0.00	0.68	-0.68	†
S10	2	K031801	0.84	0.83	0.16	†	†	†
	3	K031901	0.55	-0.17	0.00	0.71	-0.71	†
	6	K032201	1.06	0.35	0.14	†	†	†
	7	K032301	0.90	1.48	0.16	†	†	†
	8	K032401	1.14	1.18	0.19	†	†	†
S11	2	K099501	0.36	1.77	0.00	1.53	-1.53	†
	4	K090001	1.43	1.55	0.18	†	†	†
	6	K099301	0.80	-0.10	0.26	†	†	†
	9	K098701	1.25	0.48	0.15	†	†	†
	13	K099801	0.78	0.08	0.30	†	†	†
	14	K099901	0.80	2.10	0.28	†	†	†
S12	1	K033601	0.59	-1.75	0.23	†	†	†
	2	K033701	0.62	-0.89	0.15	†	†	†
	3	K033801	0.88	-0.13	0.18	†	†	†
	6	K2341CL	0.35	0.55	0.00	-0.68	1.63	-0.95
	9	K034401	0.48	0.34	0.00	0.54	-0.54	†
	10	K034501	0.65	1.23	0.00	1.81	-1.48	-0.33
	11	K034502	0.49	1.56	0.00	-0.40	0.40	†
S13	7	K035001	1.04	-0.20	0.34	†	†	†
	8	K035101	0.62	1.22	0.15	†	†	†
	9	K034102	0.73	-1.34	0.16	†	†	†
	10	K035201	0.92	0.87	0.00	†	†	†
	11	K035301	0.65	0.72	0.00	2.43	-0.68	-1.75
S14	7	K036001	0.98	2.09	0.25	†	†	†
	8	K036101	0.67	1.33	0.00	1.28	-1.28	†
S15	5	K037401	0.97	2.46	0.00	0.27	-0.27	†
	7	K037601	0.77	1.66	0.00	0.45	-0.45	†
S20	2	K094201	0.28	-1.59	0.21	†	†	†
	3	K099401	0.76	0.70	0.42	†	†	†
	8	K094701	1.45	1.18	0.29	†	†	†
	12	K099601	0.43	0.88	0.00	0.81	-0.81	†
	13	K094301	0.60	2.09	0.26	†	†	†
S21	2	K039601	0.78	-0.88	0.13	†	†	†
	4	K039801	0.49	-1.27	0.00	1.26	-1.26	†
	10	K040401	0.40	2.12	0.00	-2.90	3.17	-0.26
	11	K040501	0.67	0.85	0.00	†	†	†
† 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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