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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 Not Permitted [R2]): 2000

NAEP Technical DocumentationIRT parameters for the earth science scale, by block and item, grade 4 science state assessment (accommodations not permitted [R2]): 2000

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3
S7	1	K031401	0.30	3.15	0.00	2.56	-0.10	-2.46
	2	K031402	0.68	1.08	0.00	†	†	†
	3	K031403	0.76	-0.39	0.00	0.54	-0.54	†
	4	K031404	1.03	-0.28	0.00	†	†	†
	5	K031405	1.42	1.86	0.18	†	†	†
	6	K031406	0.72	0.60	0.43	†	†	†
	7	K031407	0.40	-0.90	0.00	†	†	†
	8	K031408	0.65	0.10	0.00	0.54	-0.54	†
	9	K031409	0.88	0.17	0.00	†	†	†
	10	K031410	0.42	0.68	0.00	0.67	-0.67	†
S10	2	K031801	0.76	0.76	0.13	†	†	†
	3	K031901	0.55	-0.19	0.00	0.72	-0.72	†
	6	K032201	1.03	0.32	0.12	†	†	†
	7	K032301	0.85	1.49	0.15	†	†	†
	8	K032401	1.13	1.17	0.19	†	†	†
S11	2	K099501	0.36	1.77	0.00	1.56	-1.56	†
	4	K090001	1.26	1.55	0.16	†	†	†
	6	K099301	0.69	-0.33	0.18	†	†	†
	9	K098701	1.16	0.42	0.13	†	†	†
	13	K099801	0.73	-0.00	0.29	†	†	†
	14	K099901	0.53	2.34	0.24	†	†	†
S12	1	K033601	0.57	-1.91	0.21	†	†	†
	2	K033701	0.61	-0.96	0.14	†	†	†
	3	K033801	0.90	-0.13	0.20	†	†	†
	6	K2341CL	0.35	1.68	0.00	0.39	2.78	0.07
	9	K034401	0.46	0.30	0.00	0.56	-0.56	†
	10	K034501	0.62	1.23	0.00	1.83	-1.53	-0.30
	11	K034502	0.47	1.59	0.00	-0.42	0.42	†
S13	7	K035001	1.08	-0.14	0.38	†	†	†
	8	K035101	0.62	1.15	0.14	†	†	†
	9	K034102	0.69	-1.46	0.16	†	†	†
	10	K035201	0.89	0.84	0.00	†	†	†
	11	K035301	0.65	0.67	0.00	2.48	-0.71	-1.77
S14	7	K036001	0.96	2.12	0.25	†	†	†
	8	K036101	0.67	1.31	0.00	1.26	-1.26	†
S15	5	K037401	0.98	2.45	0.00	0.25	-0.25	†
	7	K037601	0.76	1.67	0.00	0.46	-0.46	†
S20	2	K094201	0.26	-1.75	0.21	†	†	†
	3	K099401	0.63	0.55	0.38	†	†	†
	8	K094701	1.30	1.14	0.27	†	†	†
	12	K099601	0.44	0.83	0.00	0.79	-0.79	†
	13	K094301	0.52	1.99	0.23	†	†	†
S21	2	K039601	0.77	-0.89	0.13	†	†	†
	4	K039801	0.49	-1.25	0.00	1.22	-1.22	†
	10	K040401	0.43	2.04	0.00	-2.66	2.93	-0.27
	11	K040501	0.68	0.82	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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