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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 4 Reading Combined National and State Assessment, by Block and Item: 2017

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

IRT parameters for items in the reading for information 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
R4	1	R070201	0.74	0.63	0.26	†	†	†	†
	2	R070202	1.32	0.59	0.16	†	†	†	†
	3	R070203	1.22	-0.31	0.32	†	†	†	†
	4	R070204	0.70	1.42	†	1.25	-1.25	†	†
	5	R070205	1.86	-0.56	0.32	†	†	†	†
	6	R070206	1.01	0.77	†	1.22	-0.89	-0.33	†
	7	R070207	1.89	-0.15	0.29	†	†	†	†
	8	R070208	1.52	0.25	0.26	†	†	†	†
	9	R070209	1.60	0.19	0.18	†	†	†	†
	10	R070210	0.58	0.74	†	-0.01	0.01	†	†
R7	1	R058801	1.86	0.24	0.55	†	†	†	†
	2	R058802	1.56	-0.07	0.26	†	†	†	†
	3	R058803	3.35	0.30	0.26	†	†	†	†
	4	R058804	1.73	0.32	0.26	†	†	†	†
	5	R058805	0.46	1.74	†	†	†	†	†
	6	R058806	1.09	1.01	0.24	†	†	†	†
	7	R058807	0.54	0.42	†	0.91	0.40	-1.31	†
	8	R058808	1.84	0.60	0.32	†	†	†	†
	9	R058809	1.52	0.63	0.30	†	†	†	†
	10	R058810	0.63	0.76	†	0.70	-0.70	†	†
R8	1	R079701	1.91	0.22	0.11	†	†	†	†
	2	R079702	1.54	0.09	0.31	†	†	†	†
	3	R079703	0.57	0.23	†	0.99	-0.99	†	†
	4	R079704	1.04	0.20	0.25	†	†	†	†
	5	R079705	1.52	0.19	0.32	†	†	†	†
	6	R079706	0.81	0.75	†	-0.35	0.35	†	†
	7	R079707	1.14	0.66	†	0.70	-0.11	-0.59	†
	8	R079708	1.30	0.70	0.32	†	†	†	†
	9	R079709	1.08	1.42	†	0.92	-0.92	†	†
	10	R079710	1.55	0.43	0.18	†	†	†	†
R9	1	R0P4101	1.09	0.25	0.19	†	†	†	†
	2	R0P4102	0.74	0.40	†	0.90	-0.90	†	†
	3	R0P4103	1.30	0.31	0.30	†	†	†	†
	4	R0P4104	1.10	0.08	0.26	†	†	†	†
	5	R0P4106	1.34	0.68	0.35	†	†	†	†
	6	R0P4107	1.31	0.82	0.25	†	†	†	†
	7	R0P4108	0.98	0.54	†	†	†	†	†
	8	R0P4109	0.54	0.75	†	0.77	0.02	-0.79	†
	9	R0P4110	0.70	0.63	†	1.07	-1.07	†	†
R10	1	R069301	1.25	0.32	0.25	†	†	†	†
	2	R069302	1.09	-0.19	0.36	†	†	†	†
	3	R069303	0.51	-0.06	0.24	†	†	†	†
	4	R069304	0.76	-0.80	0.29	†	†	†	†
	5	R069305	1.22	0.95	†	†	†	†	†
	6	R069307	1.42	0.98	0.19	†	†	†	†
	7	R069308	0.67	1.56	†	1.04	0.19	-1.23	†
	8	R069309	1.21	0.29	0.24	†	†	†	†
	† 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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