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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 Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the earth science scale, by block and item, grade 12 science national main assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S5	1	K040801	0.58	-0.99	0.00	†	†	†
	1	K040802	1.18	-2.23	0.00	†	†	†
	1	K040808	0.62	-0.79	0.00	-1.41	1.41	†
	1	K040809	0.60	-0.12	0.00	-1.24	1.24	†
	2	K040803	0.52	-0.24	0.00	-1.02	1.02	†
	3	K040804	1.58	0.66	0.00	†	†	†
	4	K040805	1.19	0.62	0.00	†	†	†
	5	K040806	0.91	1.11	0.00	†	†	†
S7	4	K105801	1.18	0.16	0.24	†	†	†
	8	K105401	0.27	2.27	0.28	†	†	†
	10	K105601	0.76	1.01	0.00	†	†	†
	11	K106101	1.37	1.68	0.00	-0.30	0.30	†
	13	K104701	1.07	-0.17	0.23	†	†	†
	14	K105001	0.66	1.16	0.00	0.39	-0.39	†
	15	K104801	0.95	0.74	0.25	†	†	†
	16	K104901	1.15	1.09	0.33	†	†	†
	19	K104601	0.34	1.76	0.00	2.07	-2.07	†
S9	1	K049901	0.63	-0.61	0.00	0.23	-0.23	†
	2	K049902	0.54	-0.30	0.00	0.66	-0.66	†
	3	K049903	0.66	0.39	0.00	†	†	†
	4	K049904	0.82	0.43	0.00	†	†	†
	5	K049905	0.57	-1.59	0.28	†	†	†
	6	K049906	1.81	1.53	0.36	†	†	†
	7	K049907	0.99	-0.98	0.00	†	†	†
	8	K049908	1.27	-0.21	0.00	†	†	†
	9	K049909	1.11	1.38	0.00	0.20	-0.09	-0.10
	10	K049910	0.79	1.45	0.26	†	†	†
	11	K049911	0.89	0.36	0.00	†	†	†
S10	1	K091901	0.61	-1.43	0.27	†	†	†
	2	K091001	0.97	-0.51	0.28	†	†	†
	4	K091801	1.29	1.48	0.21	†	†	†
	14	K090501	0.67	1.87	0.00	0.55	-0.55	†
	16	K094601	1.05	1.67	0.00	-0.29	0.29	†
	18	K092101	0.76	1.49	0.00	-0.28	0.28	†
	20	K094801	1.40	0.94	0.14	†	†	†
S11	4	K051601	1.14	0.91	0.21	†	†	†
	5	K051701	0.72	0.40	0.00	†	†	†
	6	K051801	0.23	1.43	0.00	0.84	-0.84	†
S12	3	K047001	0.87	0.49	0.38	†	†	†
	6	K047301	0.50	0.46	0.00	0.58	-0.58	†
	9	K047601	1.00	1.57	0.11	†	†	†
S13	2	K048301	0.69	-0.94	0.23	†	†	†
	6	K048701	0.59	-0.13	0.28	†	†	†
	7	K048801	1.35	1.26	0.29	†	†	†
	13	K049401	0.58	1.53	0.00	1.43	-1.43	†
	14	K049402	0.48	0.19	0.00	0.72	-0.72	†
	15	K0494CL	0.28	0.54	0.00	-3.38	3.38	†
S14	3	K052801	0.44	1.22	0.32	†	†	†
	6	K053001	0.46	2.85	0.00	1.87	-1.87	†
	12	K053501	2.13	1.01	0.29	†	†	†
S20	2	K094501	0.86	-1.04	0.22	†	†	†
	5	K100001	0.59	1.72	0.00	†	†	†
	6	K100101	0.66	0.84	0.00	0.68	-0.68	†
	16	K091501	0.58	1.52	0.25	†	†	†
	17	K092001	0.58	0.39	0.00	0.68	-0.68	†
	18	K094401	0.76	2.92	0.26	†	†	†
S21	2	K058701	0.36	-0.88	0.30	†	†	†
	4	K058901	0.90	0.66	0.27	†	†	†
	8	K059301	0.51	1.99	0.00	-2.19	2.19	†
	12	K059701	0.68	1.59	0.23	†	†	†
	13	K059801	0.88	1.29	0.00	†	†	†
	14	K059901	0.74	1.58	0.00	1.35	-1.35	†
	15	K060001	0.49	1.38	0.00	†	†	†
	16	K060101	0.38	2.77	0.00	-0.05	0.05	†
† 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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