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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 Reading for Literary Experience Subscale, Grade 4 Reading Combined National and State Assessment, by Block and Item: 2017

NAEP Technical DocumentationIRT Parameters for Items in the Reading for Literary Experience Subscale, Grade 4 Reading Combined National and State Assessment, by Block and Item: 2017

IRT parameters for items in the reading for literary experience subscale, grade 4 reading combined national and state assessment, by block and item: 2017
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
R1	1	R068901	1.10	-0.19	0.23	†	†	†	†
	2	R068902	1.12	1.30	0.27	†	†	†	†
	3	R068903	0.87	-0.31	0.18	†	†	†	†
	4	R068904	0.60	-0.10	†	†	†	†	†
	5	R068905	1.35	-0.66	0.35	†	†	†	†
	6	R068906	1.12	-1.27	0.17	†	†	†	†
	7	R068907	0.58	0.77	†	1.70	0.63	-2.33	†
	8	R068908	1.36	-0.77	0.10	†	†	†	†
	9	R068909	0.63	-0.83	0.17	†	†	†	†
	10	R068910	0.50	-0.23	†	0.56	-0.56	†	†
	11	R068911	0.62	-1.06	0.23	†	†	†	†
R2	1	R057801	1.11	-0.80	0.17	†	†	†	†
	2	R057802	1.05	-0.30	0.17	†	†	†	†
	4	R057804	1.09	-0.15	0.27	†	†	†	†
	5	R057805	0.54	-0.03	0.27	†	†	†	†
	6	R057806	0.65	0.37	†	1.74	0.10	-1.84	†
	7	R057807	0.78	-0.76	†	†	†	†	†
	8	R057808	0.79	0.78	0.18	†	†	†	†
	9	R057809	0.68	0.78	†	1.26	-1.26	†	†
R3	1	R079301	2.11	0.39	0.37	†	†	†	†
	2	R079302	2.11	-0.13	0.27	†	†	†	†
	3	R079303	1.88	-0.51	0.24	†	†	†	†
	4	R079304	0.97	-0.30	0.13	†	†	†	†
	5	R079305	1.69	0.99	0.15	†	†	†	†
	6	R079306	0.79	0.36	†	0.42	-0.42	†	†
	7	R079307	0.60	0.61	†	0.82	0.49	-1.32	†
	8	R079309	0.60	0.86	†	-0.16	0.16	†	†
	9	R079310	2.34	0.15	0.20	†	†	†	†
	10	R079312	1.37	0.44	0.28	†	†	†	†
R5	1	R079501	2.05	0.40	0.19	†	†	†	†
	2	R079502	0.76	-0.14	0.17	†	†	†	†
	3	R079504	0.58	1.06	†	0.18	-0.18	†	†
	4	R079505	1.32	0.40	0.20	†	†	†	†
	5	R079506	0.66	0.43	0.19	†	†	†	†
	6	R079507	0.57	0.80	†	0.47	-0.74	0.28	†
	7	R079508	1.08	0.36	†	†	†	†	†
	8	R079509	1.51	0.48	0.24	†	†	†	†
	9	R079510	0.63	1.17	†	0.60	-0.60	†	†
	10	R079511	1.77	0.61	0.18	†	†	†	†
R6	1	R058601	1.19	0.30	0.14	†	†	†	†
	2	R058602	0.59	1.03	†	0.41	-0.41	†	†
	3	R058603	1.39	0.36	0.43	†	†	†	†
	4	R058604	1.45	0.36	0.25	†	†	†	†
	5	R058605	1.12	0.73	0.17	†	†	†	†
	6	R058606	0.72	1.24	†	0.59	-0.59	†	†
	7	R058607	1.50	0.36	0.32	†	†	†	†
	8	R058608	0.71	1.50	†	1.38	-0.43	-0.96	†
	9	R058609	1.04	0.81	0.14	†	†	†	†
	10	R058610	1.14	0.13	0.29	†	†	†	†
† 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, 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 assumed to be exactly zero and is not estimated 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), 2017 Reading Assessment.

Last updated 11 May 2022 (SK)

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