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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 8 Reading Combined National and State Assessment, by Item and Block: 2015

NAEP Technical DocumentationIRT Parameters for Items in the Literary Subscale, Grade 8 Reading Combined National and State Assessment, by Item and Block: 2015

IRT parameters for items in the literary subscale, grade 8 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	R059601	0.43	0.36	0.12	†	†	†	†	†
	2	R059602	0.54	-0.62	0.22	†	†	†	†	†
	3	R059603	0.93	-0.60	0.21	†	†	†	†	†
	4	R059604	0.73	-1.45	†	†	†	†	†	†
	5	R059610	0.41	-0.13	†	0.34	-0.86	0.52	†	†
	6	R059606	0.69	-0.61	†	0.38	-0.38	†	†	†
	7	R059605	0.72	0.75	†	0.74	-0.74	†	†	†
	8	R059608	0.73	-0.17	0.32	†	†	†	†	†
	9	R059609	0.76	-1.67	0.27	†	†	†	†	†
	10	R059607	0.49	-0.65	†	0.08	-0.08	†	†	†
R2	1	R069801	0.41	-0.73	†	2.60	-2.60	†	†	†
	2	R069802	0.77	-0.13	0.18	†	†	†	†	†
	3	R069803	1.45	-0.66	0.38	†	†	†	†	†
	4	R069804	0.83	-0.12	†	0.96	-0.96	†	†	†
	5	R069805	0.81	0.28	0.37	†	†	†	†	†
	6	R069806	0.58	-0.08	†	1.66	0.28	-1.94	†	†
	7	R069807	1.12	-0.53	0.28	†	†	†	†	†
	8	R069808	0.72	-1.14	0.25	†	†	†	†	†
	9	R069809	0.98	-0.73	0.30	†	†	†	†	†
	10	R069810	0.51	0.17	†	0.20	-0.20	†	†	†
R5	1	R079501	1.52	-1.05	0.15	†	†	†	†	†
	2	R079502	0.57	-2.37	0.20	†	†	†	†	†
	3	R079504	0.45	-0.72	†	-0.79	0.79	†	†	†
	4	R079505	0.73	-1.32	0.09	†	†	†	†	†
	5	R079506	0.55	-0.83	0.22	†	†	†	†	†
	6	R079507	0.42	-1.16	†	0.41	-0.96	0.55	†	†
	7	R079508	0.75	-1.36	†	†	†	†	†	†
	8	R079509	0.95	-0.91	0.30	†	†	†	†	†
	9	R079510	0.37	-1.13	†	0.74	-0.74	†	†	†
	10	R079511	1.24	-1.08	0.14	†	†	†	†	†
R6	1	R058601	0.96	-1.23	0.16	†	†	†	†	†
	2	R058602	0.44	-0.57	†	1.10	-1.10	†	†	†
	3	R058603	1.29	-1.01	0.37	†	†	†	†	†
	4	R058604	1.28	-1.04	0.18	†	†	†	†	†
	5	R058605	0.69	-1.05	0.09	†	†	†	†	†
	6	R058606	0.58	-0.31	†	0.21	-0.21	†	†	†
	7	R058607	1.20	-0.77	0.30	†	†	†	†	†
	8	R058608	0.59	-0.25	†	1.28	-0.39	-0.89	†	†
	9	R058609	0.76	-0.62	0.12	†	†	†	†	†
	10	R058610	1.01	-1.18	0.30	†	†	†	†	†
R9	1	R060501	0.42	-0.90	0.16	†	†	†	†	†
	2	R060502	1.34	-1.78	0.27	†	†	†	†	†
	3	R060503	0.64	-0.42	†	0.56	-0.56	†	†	†
	4	R060504	0.97	-0.84	0.21	†	†	†	†	†
	5	R060505	0.58	-0.67	†	1.15	-0.78	-0.38	†	†
	6	R060507	0.37	0.05	†	1.53	-1.53	†	†	†
	7	R060508	0.69	0.84	†	1.17	-1.17	†	†	†
	8	R060509	0.51	-0.47	†	0.08	-0.08	†	†	†
	9	R060510	0.69	-1.42	0.37	†	†	†	†	†
	10	R060511	0.67	-1.39	0.26	†	†	†	†	†
R10	1	R060601	0.91	-0.38	0.19	†	†	†	†	†
	2	R060602	0.60	-1.30	0.20	†	†	†	†	†
	3	R060607	0.59	-0.52	†	2.00	-2.00	†	†	†
	4	R060604	0.67	-1.28	0.36	†	†	†	†	†
	5	R060605	0.68	-0.51	†	1.51	-1.51	†	†	†
	6	R060606	0.52	1.23	†	2.21	-1.50	-0.71	†	†
	7	R060610	0.96	-0.17	0.23	†	†	†	†	†
	8	R060608	0.58	0.04	†	0.33	-0.33	†	†	†
	9	R060609	1.25	-0.96	0.31	†	†	†	†	†
	10	R060603	0.60	0.00	†	0.67	-0.67	†	†	†
† 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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