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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 Information Subscale, Grade 8 Reading Combined National and State Assessment, by Block and Item: 2017

NAEP Technical DocumentationIRT Parameters for Items in the Reading for Information Subscale, Grade 8 Reading Combined National and State Assessment, by Block and Item: 2017

IRT parameters for items in the reading for information subscale, grade 8 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
R3	1	R060101	0.55	-0.84	0.23	†	†	†	†
	2	R060102	0.92	-0.50	0.29	†	†	†	†
	3	R060103	0.71	-0.77	†	†	†	†	†
	4	R060104	0.80	-0.87	0.21	†	†	†	†
	5	R060105	0.89	-0.45	†	†	†	†	†
	6	R060106	0.81	-0.09	0.17	†	†	†	†
	7	R060107	1.14	0.48	0.25	†	†	†	†
	8	R060108	0.59	0.13	†	0.47	0.26	-0.74	†
	9	R060109	0.75	0.56	0.11	†	†	†	†
	10	R060110	0.62	0.11	0.19	†	†	†	†
R4	1	R080001	1.36	-0.20	0.38	†	†	†	†
	2	R080002	1.01	0.59	0.20	†	†	†	†
	3	R080003	0.73	-0.23	0.22	†	†	†	†
	4	R080004	1.48	0.05	0.24	†	†	†	†
	5	R080005	0.79	0.43	†	0.36	-0.04	-0.32	†
	6	R080006	1.24	0.08	0.15	†	†	†	†
	7	R080007	0.64	0.67	†	†	†	†	†
	8	R080008	0.56	2.22	0.32	†	†	†	†
	9	R080009	0.63	0.79	†	0.99	-0.99	†	†
	10	R080010	0.70	0.50	†	0.89	-0.89	†	†
R7	1	R058801	1.33	-0.70	0.50	†	†	†	†
	2	R058802	1.42	-1.52	0.21	†	†	†	†
	3	R058803	1.98	-0.90	0.24	†	†	†	†
	4	R058804	0.93	-1.05	0.15	†	†	†	†
	5	R058805	0.28	1.22	†	†	†	†	†
	6	R058806	0.48	-0.49	0.15	†	†	†	†
	7	R058807	0.48	-1.09	†	1.10	0.49	-1.59	†
	8	R058808	0.94	-0.87	0.31	†	†	†	†
	9	R058809	0.82	-0.51	0.21	†	†	†	†
	10	R058810	0.47	-0.85	†	0.83	-0.83	†	†
R8	1	R079701	1.17	-1.03	0.11	†	†	†	†
	2	R079702	1.03	-1.29	0.34	†	†	†	†
	3	R079703	0.70	-0.33	†	†	†	†	†
	4	R079704	0.65	-1.66	0.14	†	†	†	†
	5	R079705	1.34	-1.03	0.28	†	†	†	†
	6	R079706	0.67	-0.68	†	-0.63	0.63	†	†
	7	R079707	0.65	-0.60	†	0.67	0.17	-0.84	†
	8	R079708	0.98	-0.67	0.35	†	†	†	†
	9	R079709	0.72	0.30	†	1.23	-1.23	†	†
	10	R079710	1.17	-0.99	0.17	†	†	†	†
R11	1	R0Q4101	0.76	0.44	0.23	†	†	†	†
	2	R0Q4102	0.87	-0.31	0.29	†	†	†	†
	3	R0Q4103	0.47	-0.70	†	-0.38	0.38	†	†
	4	R0Q4104	0.74	-1.51	†	†	†	†	†
	5	R0Q4105	0.99	-0.10	0.35	†	†	†	†
	6	R0Q4106	0.57	0.13	†	0.68	-0.68	†	†
	7	R0Q4107	0.94	1.05	†	0.98	-0.28	-0.70	†
	8	R0Q4108	0.94	-0.24	0.15	†	†	†	†
	9	R0Q4109	1.09	0.61	0.18	†	†	†	†
	10	R0Q4110	0.99	0.11	0.34	†	†	†	†
R12	1	R061001	1.02	-1.37	0.15	†	†	†	†
	2	R061002	0.75	-0.76	0.27	†	†	†	†
	3	R061003	0.73	-0.14	†	0.54	-0.54	†	†
	4	R061004	0.74	-1.26	†	†	†	†	†
	5	R061005	0.41	-0.57	0.19	†	†	†	†
	6	R061006	0.77	-0.26	†	†	†	†	†
	7	R061007	0.49	0.57	†	1.43	-2.00	0.57	†
	8	R061008	0.82	-0.28	0.20	†	†	†	†
	9	R061009	0.94	-1.21	0.12	†	†	†	†
	10	R061010	0.49	0.53	†	1.57	-1.57	†	†
R13	1	R069701	1.15	-0.28	0.21	†	†	†	†
	2	R069702	1.32	0.33	0.38	†	†	†	†
	3	R069703	0.47	0.01	0.23	†	†	†	†
	4	R069704	1.61	-1.34	0.40	†	†	†	†
	5	R069705	0.98	-0.50	†	†	†	†	†
	6	R069706	0.94	-0.23	†	0.91	-0.91	†	†
	7	R069707	0.53	1.19	†	0.43	-0.56	0.13	†
	8	R069708	0.64	0.22	†	0.64	-0.64	†	†
	9	R069709	1.24	-1.21	0.24	†	†	†	†
	10	R069710	0.97	0.30	0.22	†	†	†	†
† 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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