Table of Contents | Search Technical Documentation | References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for Items in the Earth and Space Sciences Subscale, Grade 12 Science National Assessment, by Block and Item: 2019

NAEP Technical DocumentationIRT Parameters for Items in the Earth and Space Sciences Subscale, Grade 12 Science National Assessment, by Block and Item: 2019

IRT parameters for items in the Earth and space sciences subscale, grade 12 science DBA national assessment, by block and item: 2019
Item	NAEP ID	a	b	c	d	d	d	d
Not applicable; c parameters are not estimated for the two-parameter logistic or generalized partial credit models, and d parameters are not estimated for the two-parameter or three-parameter logistic models.
DBA = Digitally based assessment. For item j, a represents the discriminatory power of the item, b represents a location parameter related to item difficulty, c represents the guessing parameter, and d 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 may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Block S2
2	K177801	0.49	-1.45	0.27
9	K215301	0.95	1.10	0.37
12	K174901	0.33	1.63		0.64	-0.64
14	K174801	1.29	0.12	0.28
Block S3
4	K133301	0.37	2.53		-0.71	0.65	0.06
5	K1572CL	0.39	1.58		2.01	1.77	-3.78
Block S4
2	K128001	0.28	-1.11	0.29
10	K157701	0.93	2.52	0.35
11	K157801	0.71	0.39	0.28
12	K157901	0.80	0.63		0.56	-0.56
18	K130201	0.67	0.48	0.26
Block S5
3	K218101	1.06	0.52	0.34
11	K2169MS	0.64	0.46
14	K2161MS	0.31	1.59		0.86	-0.86
Block S6
2	K135001	0.82	1.56		0.46	-0.11	-0.35
3	K134701	1.06	1.28	0.27
4	K130901	0.30	-0.23	0.28
10	K140501	0.68	0.69	0.24
11	K143201	0.83	-0.39	0.32
16	K130701	1.05	1.10	0.32
17	K126001	0.57	1.51		-0.20	0.43	0.40	-0.63
Block S7
3	K131401	0.94	0.49	0.36
7	K131901	1.14	1.11	0.10
13	K141901	1.42	0.56	0.16
14	K158301	0.64	1.39		0.50	-0.50
16	K132101	1.52	0.11	0.22
Block S8
2	K140801	1.17	0.82	0.21
8	K142401	0.68	0.38		0.32	-0.32
11	K2151MS	0.41	0.74		-0.05	-1.38	1.44
12	K215113	0.94	1.12	0.31
15	K137001	0.94	0.77	0.26
Block S9
2	K175501	2.15	0.58	0.24
7	K175901	1.35	0.91	0.16
11	K1776CL	0.48	0.30		-2.10	1.92	0.18
18	K176301	2.27	0.82	0.27
Block S10
2	K177401	0.93	0.51	0.22
6	K172901	0.33	0.36		0.55	-2.81	2.27
12	K173401	0.74	0.17	0.31
Block S11
2	K139301	1.08	-0.21	0.26
9	K125802	0.77	1.30		0.35	-0.35
10	K125803	0.51	1.62		-0.93	0.93
15	K141801	1.68	1.61	0.32
Block S12
2	K133001	0.84	1.63	0.27
5	K128701	0.56	1.03		1.32	0.11	-1.69	0.25
14	K142101	0.77	0.73	0.25
16	K130301	0.66	0.73		1.05	-1.05
Block S13
2	K217401	1.74	0.54	0.28
9	K179201	1.97	1.49	0.21
10	K179301	0.81	1.63		-0.23	0.23
13	K216702	0.90	1.22		0.37	-0.37
Block I5
1	K1960MS	1.07	-0.67
2	K196101	0.63	0.83		-1.21	1.21
3	K196201	0.65	1.19		1.81	-1.81
4	K1963MS	0.38	4.14		0.44	-0.44
5	K1964CL	0.62	0.02		1.14	-1.14
6	K1965MS	0.63	-1.13		-1.15	1.15
7&8	K196XCL	0.63	-0.62		0.67	0.58	-0.15	-1.10
9	K1968MS	0.46	-1.42		-4.13	-1.22	5.35
10	K196901	0.79	1.15		0.19	-0.19
11	K197001	0.71	-0.40		-0.54	0.54
12	K197102	0.63	1.86		0.25	-0.25

IRT parameters for items in the Earth and space sciences subscale, grade 12 science PBA national assessment, by block and item: 2019
Item	NAEP ID	a	b	c	d	d	d	d
Not applicable; c parameters are not estimated for the two-parameter logistic or generalized partial credit models, and d parameters are not estimated for the two-parameter or three-parameter logistic models.
PBA = Paper-based assessment. For item j, a represents the discriminatory power of the item, b represents a location parameter related to item difficulty, c represents the guessing parameter, and d 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 may not sum to zero because of rounding.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Science Assessment.
Block S3
4	K133301	0.37	2.21		-0.99	0.99
5	K1572CL	0.31	1.44		1.85	2.78	-4.63
Block S4
2	K128001	0.37	-1.11	0.25
10	K157701	1.76	1.89	0.30
11	K157801	0.66	0.08	0.21
12	K157901	0.68	0.82		0.61	-0.61
18	K130201	0.88	1.00	0.24
Block S5
4	K143901	0.75	0.06	0.26
5	K143902	1.69	2.33	0.19
6	K143903	0.57	1.92		0.33	-0.33
10	K130301	0.51	0.69		1.06	-1.06
Block S6
2	K135001	0.84	1.89		0.31	0.04	-0.36
3	K134701	0.79	1.00	0.23
5	K130901	0.31	0.29	0.30
11	K140501	0.70	0.61	0.26
12	K143201	0.88	-0.48	0.24
17	K130701	1.65	1.14	0.31
Block S7
3	K131401	0.59	0.29	0.30
7	K131901	0.89	1.27	0.11
13	K141901	1.37	0.50	0.19
14	K158301	0.61	1.57		0.47	-0.47
16	K132101	1.62	0.07	0.22
Block S8
2	K140801	1.21	0.67	0.21
9	K142401	0.61	0.29		0.37	-0.37
12	K137651	0.43	0.88		-1.09	-0.06	1.14
13	K137652	1.43	1.33	0.35
16	K137001	1.22	0.66	0.26
Block S9
2	K175501	1.83	0.56	0.23
7	K175901	1.11	0.83	0.15
11	K1776CL	0.34	0.21		-3.57	3.12	0.45
18	K176301	1.53	0.62	0.20
Block S10
2	K177401	0.59	0.74	0.24
6	K172901	0.33	-0.35		0.15	-2.80	2.64
12	K173401	0.82	0.33	0.31
Block S11
2	K139301	0.94	-0.24	0.30
9	K125802	0.81	1.82		0.64	-0.64
10	K125803	0.58	1.55		-0.71	0.71
15	K141801	2.30	1.41	0.30
Block S12
2	K133001	0.71	1.94	0.26
5	K128701	0.41	1.18		0.65	0.61	-2.04	0.78
15	K142101	0.61	0.45	0.24
Block S13
2	K129501	1.16	1.62	0.49
4	K126001	0.73	1.39		0.46	0.18	0.02	-0.65
13	K144601	1.16	1.18	0.23

Last updated 05 December 2023 (SK)

Printer-friendly Version

​​​NAEP Technical DocumentationIRT Parameters for Items in the Earth and Space Sciences Subscale, Grade 12 Science National Assessment, by Block and Item: 2019

NAEP Technical DocumentationIRT Parameters for Items in the Earth and Space Sciences Subscale, Grade 12 Science National Assessment, by Block and Item: 2019