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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Reading Assessment IRT Parameters → IRT Parameters for Items in the Literary Subscale, Grade 4 Reading Combined National and State Assessment, by Item and Block: 2015

NAEP Technical DocumentationIRT Parameters for Items in the Literary Subscale, Grade 4 Reading Combined National and State Assessment, by Item and Block: 2015

IRT parameters for items in the literary subscale, grade 4 reading combined national and state assessment, by item and block: 2015
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
R1	1	R068901	1.18	-0.41	0.30	†	†	†	†	†
	2	R068902	1.46	1.18	0.30	†	†	†	†	†
	3	R068903	1.03	-0.22	0.27	†	†	†	†	†
	4	R068904	0.63	-0.15	†	†	†	†	†	†
	5	R068905	1.28	-0.87	0.34	†	†	†	†	†
	6	R068906	1.02	-1.32	0.19	†	†	†	†	†
	7	R068907	0.57	0.64	†	1.83	0.31	-2.13	†	†
	8	R068908	1.38	-0.71	0.19	†	†	†	†	†
	9	R068909	0.75	-0.92	0.25	†	†	†	†	†
	10	R068910	0.43	-0.49	†	0.30	-0.30	†	†	†
	11	R068911	0.61	-1.06	0.26	†	†	†	†	†
R2	1	R057801	1.18	-0.92	0.36	†	†	†	†	†
	2	R057802	1.22	-0.16	0.27	†	†	†	†	†
	4	R057804	0.99	-0.69	0.24	†	†	†	†	†
	5	R057805	0.64	-0.26	0.23	†	†	†	†	†
	6	R057806	0.55	0.15	†	1.92	0.08	-2.00	†	†
	7	R057807	0.75	-1.15	†	†	†	†	†	†
	8	R057808	0.83	0.79	0.24	†	†	†	†	†
	9	R057809	0.62	0.46	†	1.48	-1.48	†	†	†
R3	1	R079301	1.80	0.03	0.25	†	†	†	†	†
	2	R079302	2.46	-0.33	0.27	†	†	†	†	†
	3	R079303	1.81	-0.80	0.33	†	†	†	†	†
	4	R079304	1.07	-0.44	0.14	†	†	†	†	†
	5	R079305	1.33	0.73	0.17	†	†	†	†	†
	6	R079306	0.82	0.19	†	0.60	-0.60	†	†	†
	7	R079307	0.64	0.25	†	0.78	0.15	-0.92	†	†
	8	R079309	0.47	0.73	†	-0.23	0.23	†	†	†
	9	R079310	2.14	-0.05	0.20	†	†	†	†	†
	10	R079312	1.54	0.33	0.31	†	†	†	†	†
R5	1	R079501	1.93	0.25	0.17	†	†	†	†	†
	2	R079502	0.85	-0.18	0.20	†	†	†	†	†
	3	R079504	0.64	0.67	†	-0.03	0.03	†	†	†
	4	R079505	1.30	0.34	0.22	†	†	†	†	†
	5	R079506	0.84	0.56	0.28	†	†	†	†	†
	6	R079507	0.50	0.24	†	0.44	-1.07	0.63	†	†
	7	R079508	0.97	0.17	†	†	†	†	†	†
	8	R079509	1.67	0.37	0.27	†	†	†	†	†
	9	R079510	0.41	0.53	†	0.40	-0.40	†	†	†
	10	R079511	1.80	0.42	0.16	†	†	†	†	†
R6	1	R058601	1.09	-0.05	0.15	†	†	†	†	†
	2	R058602	0.51	0.65	†	0.46	-0.46	†	†	†
	3	R058603	1.21	-0.09	0.36	†	†	†	†	†
	4	R058604	1.52	0.13	0.26	†	†	†	†	†
	5	R058605	1.28	0.51	0.18	†	†	†	†	†
	6	R058606	0.63	1.04	†	0.30	-0.30	†	†	†
	7	R058607	1.40	0.22	0.30	†	†	†	†	†
	8	R058608	0.60	1.04	†	1.52	-0.41	-1.12	†	†
	9	R058609	0.97	0.36	0.14	†	†	†	†	†
	10	R058610	1.30	0.09	0.28	†	†	†	†	†
† Not applicable; c parameters are not estimated for the two-parameter logistic model or generalized partial credit models, and d parameters are not estimated for two-parameter or three-parameter logistic models. NOTE: For item j, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji represents the category threshold parameter for category i. The c parameter value is assumed to be exactly zero and is not estimated for items scaled with the two-parameter logistic model. For item j, d_ji 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), 2015 Reading Assessment.

Last updated 17 November 2021 (ML)

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