NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for Items in the Earth and Space Sciences Scale, Grade 4 Science Combined National and State Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the earth and space sciences scale, grade 4 science combined national and state main assessment, by item and block: 2009

Block	Item	NAEP ID	aj	bj	cj	dj1	dj2	dj3	dj4
† 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 represents 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), 2009 Science Assessment.
S3	1	K080101	0.67	-0.46	0.23	†	†	†	†
	10	K153001	0.60	1.42	†	0.90	-0.90	†	†
	11	K080601	0.86	0.62	0.21	†	†	†	†
	14	K080801	0.66	-1.49	0.28	†	†	†	†
	15	K106701	0.49	0.97	†	1.01	-1.01	†	†
S4	1	K079001	1.19	-0.26	0.31	†	†	†	†
	2	K078801	0.46	0.35	0.27	†	†	†	†
	9	K079301	0.41	0.34	0.17	†	†	†	†
	10	K079501	0.31	0.75	†	2.03	-0.04	-1.99	†
S5	1	K086101	0.70	-0.79	0.36	†	†	†	†
	10	K0855CL	0.44	-0.98	†	0.43	0.98	-0.02	-1.38
	11	K082301	0.97	0.85	0.11	†	†	†	†
	15	K082601	2.23	1.17	0.26	†	†	†	†
S6	1	K107301	0.70	-1.97	0.18	†	†	†	†
	3	K108001	1.40	0.69	0.20	†	†	†	†
	7	K086801	0.77	-0.47	0.39	†	†	†	†
	9	K081701	0.79	-0.42	0.13	†	†	†	†
	10	K076501	0.49	0.19	†	0.89	-0.89	†	†
	12	K087501	1.02	0.79	0.28	†	†	†	†
	16	K087901	1.06	-1.35	0.16	†	†	†	†
S7	2	K085001	0.77	-1.72	0.19	†	†	†	†
	5	K076302	0.75	0.53	†	†	†	†	†
	8	K076901	0.55	1.12	†	-0.15	0.15	†	†
	9	K076401	0.60	3.07	0.39	†	†	†	†
	15	K085101	0.79	-0.40	0.33	†	†	†	†
	16	K080401	1.42	1.28	0.38	†	†	†	†
S8	2	K109901	0.56	-0.10	0.20	†	†	†	†
	6	K077701	0.42	-0.20	†	-0.27	0.27	†	†
	13	K1097CL	0.40	1.27	†	3.10	1.11	-3.66	-0.56
S9	3	K088201	0.58	1.31	0.37	†	†	†	†
	4	K088202	1.04	2.00	0.22	†	†	†	†
	8	K084601	0.53	-0.64	0.16	†	†	†	†
	13	K089001	1.91	1.53	0.36	†	†	†	†
	15	K089201	0.62	1.51	0.26	†	†	†	†
	16	K078401	0.61	1.32	0.17	†	†	†	†
S10	4	K153901	0.59	3.83	0.26	†	†	†	†
	7	K083301	0.60	-0.14	0.24	†	†	†	†
	11	K081301	2.04	1.70	0.31	†	†	†	†
	16	K081401	1.18	1.09	0.34	†	†	†	†
	17	K154201	0.97	-0.03	0.27	†	†	†	†
S11	2	K154301	1.21	1.36	0.15	†	†	†	†
	4	K089502	0.64	-0.23	†	†	†	†	†
	10	K106601	1.21	0.51	0.26	†	†	†	†
	11	K106603	0.96	1.12	†	-0.14	0.14	†	†
	12	K106604	1.08	0.53	0.32	†	†	†	†
	15	K107201	0.73	-0.28	0.25	†	†	†	†

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