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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 Information Subscale, Grade 4 Reading Combined National and State Assessment, by Item and Block: 2015

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

IRT parameters for items in the information 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
R4	1	R070201	0.62	0.53	0.25	†	†	†	†	†
	2	R070202	1.32	0.70	0.09	†	†	†	†	†
	3	R070203	1.03	-0.55	0.22	†	†	†	†	†
	4	R070204	0.69	0.61	†	1.57	-1.57	†	†	†
	5	R070205	1.52	-0.88	0.33	†	†	†	†	†
	6	R070206	0.90	0.42	†	1.21	-1.00	-0.22	†	†
	7	R070207	1.69	-0.50	0.27	†	†	†	†	†
	8	R070208	1.26	-0.01	0.26	†	†	†	†	†
	9	R070209	1.70	0.18	0.25	†	†	†	†	†
	10	R070210	0.60	0.52	†	0.81	-0.81	†	†	†
R7	1	R058801	1.82	-0.06	0.46	†	†	†	†	†
	2	R058802	1.25	-0.33	0.28	†	†	†	†	†
	3	R058803	2.41	0.03	0.26	†	†	†	†	†
	4	R058804	1.35	0.05	0.24	†	†	†	†	†
	5	R058805	0.37	-0.30	†	1.24	-1.24	†	†	†
	6	R058806	0.91	0.85	0.25	†	†	†	†	†
	7	R058807	0.45	0.15	†	0.93	0.37	-1.30	†	†
	8	R058808	1.55	0.61	0.28	†	†	†	†	†
	9	R058809	1.21	0.29	0.26	†	†	†	†	†
	10	R058810	0.51	0.55	†	0.96	-0.96	†	†	†
R8	1	R079701	1.70	-0.02	0.14	†	†	†	†	†
	2	R079702	1.42	-0.09	0.31	†	†	†	†	†
	3	R079703	0.44	0.52	†	0.96	-0.96	†	†	†
	4	R079704	1.06	-0.17	0.24	†	†	†	†	†
	5	R079705	1.68	0.04	0.31	†	†	†	†	†
	6	R079706	0.77	0.67	†	-0.40	0.40	†	†	†
	7	R079707	0.91	0.56	†	0.79	-0.04	-0.75	†	†
	8	R079708	1.42	0.61	0.30	†	†	†	†	†
	9	R079709	0.88	1.55	†	1.45	-1.45	†	†	†
	10	R079710	1.26	0.24	0.18	†	†	†	†	†
R9	1	R058301	0.68	-0.30	0.40	†	†	†	†	†
	2	R058302	1.15	-0.37	†	†	†	†	†	†
	3	R058303	1.72	0.22	0.24	†	†	†	†	†
	4	R058304	0.55	-0.47	†	0.54	-0.54	†	†	†
	5	R058311	1.93	-0.06	0.33	†	†	†	†	†
	6	R058306	1.91	0.84	0.34	†	†	†	†	†
	7	R058307	0.70	0.40	†	0.62	-0.66	0.04	†	†
	8	R058308	1.96	0.36	0.22	†	†	†	†	†
	9	R058309	1.78	0.13	0.17	†	†	†	†	†
R10	1	R069301	1.05	0.08	0.22	†	†	†	†	†
	2	R069302	1.11	-0.49	0.39	†	†	†	†	†
	3	R069303	0.59	0.31	0.31	†	†	†	†	†
	4	R069304	0.84	-0.76	0.53	†	†	†	†	†
	5	R069305	0.86	0.73	†	†	†	†	†	†
	6	R069307	2.22	1.05	0.22	†	†	†	†	†
	7	R069308	0.57	0.97	†	1.05	0.32	-1.37	†	†
	8	R069309	1.15	0.26	0.31	†	†	†	†	†
† 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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