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

NAEP Technical DocumentationIRT parameters for the earth 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
S5	1	K040801	0.51	-1.20	0.00	†	†	†
	1	K040802	1.07	-2.27	0.00	†	†	†
	1	K040808	0.63	-0.83	0.00	-1.35	1.35	†
	1	K040809	0.61	-0.25	0.00	-1.42	1.42	†
	2	K040803	0.52	-0.31	0.00	-1.03	1.03	†
	3	K040804	1.55	0.51	0.00	†	†	†
	4	K040805	1.29	0.49	0.00	†	†	†
	5	K040806	0.96	0.88	0.00	†	†	†
S7	4	K105801	1.08	0.06	0.23	†	†	†
	8	K105401	0.25	2.45	0.29	†	†	†
	10	K105601	0.73	0.98	0.00	†	†	†
	11	K106101	1.24	1.71	0.00	-0.32	0.32	†
	13	K104701	1.05	-0.25	0.21	†	†	†
	14	K105001	0.66	1.12	0.00	0.41	-0.41	†
	15	K104801	0.97	0.77	0.29	†	†	†
	16	K104901	1.00	1.02	0.29	†	†	†
	19	K104601	0.36	1.59	0.00	1.91	-1.91	†
S8	1	K049901	0.65	-0.61	0.00	0.26	-0.26	†
S9	2	K049902	0.53	-0.32	0.00	0.65	-0.65	†
	3	K049903	0.67	0.38	0.00	†	†	†
	4	K049904	0.83	0.39	0.00	†	†	†
	5	K049905	0.59	-1.52	0.31	†	†	†
	6	K049906	1.97	1.58	0.37	†	†	†
	7	K049907	0.99	-1.00	0.00	†	†	†
	8	K049908	1.25	-0.24	0.00	†	†	†
	9	K049909	1.01	1.46	0.00	0.19	-0.09	-0.11
	10	K049910	0.81	1.44	0.27	†	†	†
	11	K049911	0.85	0.38	0.00	†	†	†
S10	1	K091901	0.60	-1.64	0.25	†	†	†
	2	K091001	0.93	-0.59	0.26	†	†	†
	4	K091801	1.22	1.50	0.20	†	†	†
	14	K090501	0.66	1.88	0.00	0.57	-0.57	†
	16	K094601	0.99	1.69	0.00	-0.30	0.30	†
	18	K092101	0.73	1.49	0.00	-0.28	0.28	†
	20	K094801	1.34	0.88	0.13	†	†	†
S11	4	K051601	1.20	0.91	0.22	†	†	†
	5	K051701	0.65	0.40	0.00	†	†	†
	6	K051801	0.22	1.44	0.00	0.86	-0.86	†
S12	3	K047001	0.60	0.21	0.26	†	†	†
	6	K047301	0.54	0.45	0.00	0.56	-0.56	†
	9	K047601	0.94	1.57	0.10	†	†	†
S13	2	K048301	0.74	-0.82	0.25	†	†	†
	6	K048701	0.58	-0.16	0.27	†	†	†
	7	K048801	1.24	1.26	0.28	†	†	†
	13	K049401	0.53	1.62	0.00	1.52	-1.52	†
	14	K049402	0.43	0.18	0.00	0.73	-0.73	†
	15	K0494CL	0.25	0.52	0.00	-3.98	3.98	†
S14	3	K052801	0.38	0.97	0.28	†	†	†
	6	K053001	0.45	2.86	0.00	1.89	-1.89	†
	12	K053501	1.24	0.82	0.26	†	†	†
S20	2	K094501	0.89	-1.08	0.22	†	†	†
	5	K100001	0.52	1.79	0.00	†	†	†
	6	K100101	0.62	0.80	0.00	0.66	-0.66	†
	16	K091501	0.61	1.45	0.25	†	†	†
	17	K092001	0.57	0.32	0.00	0.72	-0.72	†
	18	K094401	0.67	2.96	0.25	†	†	†
S21	2	K058701	0.34	-0.97	0.28	†	†	†
	4	K058901	1.02	0.66	0.28	†	†	†
	8	K059301	0.50	2.09	0.00	-2.25	2.25	†
	12	K059701	0.74	1.51	0.23	†	†	†
	13	K059801	0.91	1.27	0.00	†	†	†
	14	K059901	0.71	1.60	0.00	1.40	-1.40	†
	15	K060001	0.50	1.31	0.00	†	†	†
	16	K060101	0.40	2.71	0.00	0.03	-0.03	†
† 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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