NAEP Technical DocumentationIRT Parameters for Items in the Design and Systems Content Area, Grade 8 Technology and Engineering Literacy (TEL) National Assessment, by Assembly Unit and Item: 2018

IRT parameters for items in the design and systems content area, grade 8 technology and engineering literacy (TEL) national assessment, by assembly unit and item: 2018
Assembly unit	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4
T9	1	D007201	0.45	-0.75	†	0.88	-0.40	-0.47	†
	2	D007301	0.41	-1.52	†	-0.89	0.89	†	†
	3	D0074CL	0.41	-0.78	†	1.16	-1.16	†	†
	4	D0075CL	0.45	-0.46	†	-0.10	0.10	†	†
T10	1	D019101	0.40	-1.19	0.18	†	†	†	†
	2	D019102	1.30	-1.22	0.16	†	†	†	†
	3	D022601	0.42	-0.47	†	0.25	-0.25	†	†
	4	D0186CL	0.65	0.24	†	†	†	†	†
	5	D014101	0.67	1.20	0.18	†	†	†	†
	7	D0185CL	0.27	-0.36	†	-1.73	1.73	†	†
	8	D018701	0.96	1.94	0.09	†	†	†	†
T13	1	D0094CL	0.33	-5.43	†	†	†	†	†
	2	D0095CL	0.56	-0.91	†	†	†	†	†
	3	D009601	0.80	0.39	†	†	†	†	†
	4	D0097CL	0.28	-0.03	†	1.28	-1.28	†	†
	5	D009801	0.79	0.38	†	†	†	†	†
T14	1	D014801	0.65	-0.58	0.16	†	†	†	†
	2	D019201	0.96	0.18	0.17	†	†	†	†
	3	D0151CL	0.24	-0.53	†	0.02	-0.02	†	†
	4	D0184CL	0.49	-0.08	†	0.65	-0.65	†	†
	5	D016501	0.59	0.68	0.19	†	†	†	†
	6	D016701	0.35	0.11	†	-3.19	3.19	†	†
	7	D0167CL	0.57	0.55	†	0.84	-0.84	†	†
T15	7	D014301	0.35	-0.75	†	0.15	-0.15	†	†
	8	D014302	0.61	-1.60	0.18	†	†	†	†
	9	D014201	0.69	1.23	0.20	†	†	†	†
	10	D0142CL	0.34	1.01	†	†	†	†	†
	11	D019901	0.78	0.83	0.21	†	†	†	†
T16	5	D0110CL	0.53	-0.63	†	-1.02	1.02	†	†
	6	D011101	0.65	-0.54	†	-0.95	0.95	†	†
	7	D011201	0.49	-0.15	†	†	†	†	†
	8	D011301	0.56	0.48	†	†	†	†	†
	9	D011401	0.53	0.85	†	1.10	-1.10	†	†
	10	D011501	0.47	1.10	†	1.55	-1.55	†	†
T17	1	D0116CL	0.65	-1.51	†	†	†	†	†
	2	D0117CL	0.30	-0.29	†	0.61	-3.40	2.79	†
	3	D011716	0.63	-0.23	†	1.20	-1.20	†	†
	4	D0118CL	0.60	-1.90	†	†	†	†	†
	5	D0119CL	0.63	0.00	†	†	†	†	†
	6	D0120CL	0.91	-2.44	†	†	†	†	†
	7	D0121CL	0.43	-2.18	†	1.39	-1.39	†	†
	8	D0122CL	0.93	-1.18	†	†	†	†	†
	13	D0212CL	0.63	1.02	†	1.23	-1.23	†	†
	14	D0216CL	0.31	0.40	†	†	†	†	†
T21	4	D019801	0.48	-0.96	†	†	†	†	†
T21	5	D019802	0.50	-0.42	†	†	†	†	†
† Not applicable; c parameters are not estimated for the two-parameter logistic 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), 2018 Technology and Engineering Literacy (TEL) Assessment.

Last updated 02 November 2022 (SK)

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