NAEP Technical DocumentationIRT Parameters for Items in the Informational Subscale, Grade 12 Reading National Assessment, by Block and Item: 2019

IRT parameters for items in the informational subscale, grade 12 reading DBA national assessment, by block and item: 2019
Item	NAEP ID	a	b	c	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 Reading Assessment.
Block R3
1	R060101	0.74	-0.93	0.20
2	R060102	1.05	-0.85	0.30
3	R060103	0.83	-1.02
4	R060104	1.21	-1.06	0.23
5	R060105	1.16	-0.73
6	R060106	1.20	-0.52	0.20
7	R060107	1.04	-0.14	0.18
8	R060108	0.71	0.00		0.29	0.44	-0.73
9	R060109	0.90	-0.16	0.13
10	R060110	0.59	-0.10	0.20
Block R4
1	R080001	1.52	-0.72	0.35
2	R080002	1.04	0.12	0.23
3	R080003	0.75	-0.70	0.19
4	R080004	1.27	-0.52	0.24
5	R080005	0.73	0.01		0.24	-0.18	-0.06
6	R080006	1.25	-0.42	0.14
7	R080007	0.84	0.20
8	R080008	0.88	1.09	0.30
9	R080009	0.76	0.34		0.58	-0.58
10	R080010	0.82	-0.06		0.51	-0.51
Block R7
1	R062201	0.98	-1.53	0.21
2	R062202	0.95	-0.82	0.24
3	R062203	0.92	-0.33
4	R062204	0.74	-1.03	0.22
5	R062205	0.88	0.03
6	R062206	0.92	-0.23	0.16
7	R062207	0.72	0.23		1.19	-1.19	0.00
8	R062208	0.63	-0.33	0.27
9	R062209	0.91	-0.15	0.24
10	R062210	1.14	0.64		0.83	-0.83
11	R062211	1.13	-0.63	0.22
Block R8
1	R062301	1.46	-0.54	0.20
2	R062302	1.22	-1.16	0.25
3	R062303	0.91	0.69		0.88	-0.88
4	R062304	1.06	0.76		0.76	-0.76
5	R062305	1.58	-0.38	0.30
6	R062307	0.54	-0.85	0.28
7	R062308	0.66	0.61		0.23	0.81	-1.04
8	R062309	1.08	-1.10	0.26
9	R062310	1.08	-0.14	0.23
10	R062311	0.84	-0.30		-0.05	0.05
Block R9
1	R062501	0.96	-0.87		0.48	-0.48
2	R062502	0.94	-0.36	0.20
3	R062511	1.08	-0.13	0.30
4	R062505	0.85	0.17		0.85	-0.85
5	R062507	0.94	0.06	0.21
6	R062508	0.65	0.18		0.80	0.24	-1.04
7	R062509	1.06	0.87	0.23
8	R062503	0.61	0.17		0.36	-0.36
9	R062510	0.73	-0.31	0.23
Block R10
1	R062701	1.23	-0.34	0.19
2	R062702	0.98	0.29	0.29
3	R062703	0.69	-1.03	0.20
4	R062704	0.94	0.20	0.20
5	R062705	1.10	0.18		0.61	-0.61
6	R062706	0.83	0.53		0.76	-0.16	-0.60
7	R062707	2.22	-0.01	0.31
8	R062708	0.91	-0.68
9	R062709	0.79	0.83	0.33
10	R062710	1.07	0.70		0.38	-0.38
Block R11
1	R062801	1.02	-0.19
2	R062802	0.73	0.25	0.18
3	R062803	1.69	0.04	0.23
4	R062804	1.24	0.28	0.25
5	R062805	0.92	0.29
6	R062806	1.55	-0.26	0.31
7	R062807	0.87	0.17		0.39	-0.39
8	R062808	0.80	0.57		1.42	-0.64	-0.78
9	R062809	1.30	0.24	0.30
10	R062810	1.56	0.01	0.25
11	R062811	1.32	0.61	0.26
Block R12
1	R093101	0.80	-0.96	0.22
2	R0931M2	0.60	-0.41
3	R0931M3	0.97	-1.33		0.45	-0.45
4	R093104	0.86	0.02	0.26
5	R093105	1.39	-0.63	0.17
6	R093106	0.76	0.41		0.23	-0.23
7	R093107	0.76	-0.22		1.41	-0.48	-0.93
8	R093108	0.64	0.31		0.37	-0.37
9	R0931M9	0.63	-0.57		1.21	-1.21
10	R093110	0.89	0.98		0.30	-0.30
11	R093111	1.10	-0.72	0.20
Block R13
1	R093201	0.40	-1.76	0.24
2	R093202	0.79	-0.05		0.54	-0.54
3	R093203	0.80	-0.04		1.28	-1.28
4	R093204	1.11	-0.66	0.21
5	R093205	0.76	0.57
6	R093206	1.59	0.95	0.19
7	R093207	0.51	-0.17		0.78	-1.18	0.40
8	R093208	1.10	-0.23	0.16
9	R093209	1.01	-0.88	0.22
10	R093210	1.00	0.05	0.27
Block R16
1	R093401	0.67	0.15	0.17
2	R093404	0.59	0.38		0.82	-0.82
3	R093405	0.80	0.00		0.79	-0.79
4	R0934M7	0.90	-0.84		0.72	-0.72
5	R0934M8	0.78	-0.52		0.92	-0.92
6	R093409	0.76	0.09	0.29
7	R093410	1.14	-0.16		0.54	-0.54
8	R093411	0.53	0.84		-0.84	0.84

IRT parameters for items in the informational subscale, grade 12 reading PBA national assessment, by block and item: 2019
Item	NAEP ID	a	b	c	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 Reading Assessment.
Block R3
1	R060101	0.75	-0.97	0.36
2	R060102	1.15	-0.40	0.43
3	R060103	0.69	-1.18
4	R060104	0.81	-1.58	0.24
5	R060105	0.94	-0.92
6	R060106	1.04	-0.64	0.24
7	R060107	1.30	0.07	0.26
8	R060108	0.56	-0.11		0.53	0.37	-0.90
9	R060109	0.68	-0.33	0.16
10	R060110	0.52	0.16	0.26
Block R4
1	R080001	1.42	-0.64	0.33
2	R080002	1.06	-0.13	0.22
3	R080003	0.63	-0.85	0.23
4	R080004	1.52	-0.46	0.29
5	R080005	0.66	-0.11		0.15	0.15	-0.30
6	R080006	1.07	-0.31	0.19
7	R080007	0.72	0.37
8	R080008	0.99	1.02	0.27
9	R080009	0.75	0.41		0.91	-0.91
10	R080010	0.71	-0.10		0.81	-0.81
Block R7
1	R062201	0.89	-1.68	0.25
2	R062202	0.82	-0.61	0.28
3	R062203	0.93	-0.39
4	R062204	0.71	-1.06	0.29
5	R062205	0.85	0.11
6	R062206	1.01	-0.15	0.14
7	R062207	0.61	0.32		1.31	-1.20	-0.11
8	R062208	0.55	-0.11	0.30
9	R062209	1.13	0.02	0.27
10	R062210	0.90	0.89		1.00	-1.00
11	R062211	1.21	-0.71	0.24
Block R8
1	R062301	1.24	-0.70	0.27
2	R062302	1.45	-1.07	0.40
3	R062303	0.88	0.70		1.16	-1.16
4	R062304	0.93	0.55		0.92	-0.92
5	R062305	1.38	-0.58	0.23
6	R062307	0.91	-0.42	0.34
7	R062308	0.56	0.61		0.04	1.30	-1.34
8	R062309	1.24	-0.68	0.29
9	R062310	1.48	0.06	0.33
10	R062311	0.68	-0.55		0.00	0.00
Block R9
1	R062501	0.80	-0.75		0.48	-0.48
2	R062502	1.35	0.01	0.30
3	R062511	1.33	0.07	0.32
4	R062505	0.68	0.36		0.90	-0.90
5	R062507	1.22	0.12	0.36
6	R062508	0.67	0.25		0.85	0.26	-1.12
7	R062509	1.15	0.91	0.26
8	R062503	0.64	0.25		0.33	-0.33
9	R062510	0.84	-0.17	0.25
Block R10
1	R062701	1.19	-0.46	0.22
2	R062702	0.88	0.16	0.30
3	R062703	0.58	-0.78	0.28
4	R062704	0.99	0.35	0.29
5	R062705	0.83	0.27		0.80	-0.80
6	R062706	0.79	0.35		0.88	-0.20	-0.69
7	R062707	1.77	-0.06	0.34
8	R062708	0.84	-0.76
9	R062709	0.79	0.72	0.36
10	R062710	0.89	0.55		0.44	-0.44
Block R11
1	R062801	0.95	-0.30
2	R062802	0.94	0.29	0.20
3	R062803	1.73	0.03	0.24
4	R062804	1.56	0.35	0.31
5	R062805	0.88	-0.29
6	R062806	2.13	-0.16	0.34
7	R062807	0.81	0.04		0.38	-0.38
8	R062808	0.67	0.44		1.40	-0.49	-0.91
9	R062809	1.21	0.15	0.32
10	R062810	1.75	0.10	0.24
11	R062811	1.63	0.41	0.23
Block R12
1	R063102	0.95	-1.86	0.32
2	R063103	1.23	0.06	0.35
3	R063101	0.77	-0.06		0.45	-0.45
4	R063104	0.93	-0.82	0.21
5	R063105	0.76	0.59		1.11	-0.74	-0.38
6	R063106	0.97	-0.83	0.25
7	R063801	0.57	-0.32		0.08	-0.08
8	R063802	1.35	-0.19	0.34
9	R063108	1.23	-0.68	0.33
10	R063109	0.68	-0.25		-1.71	1.71
11	R063110	0.87	0.50	0.28
Block R13
1	R079101	0.67	-0.52		0.21	-0.21
2	R079102	1.39	-0.32	0.23
3	R079103	0.98	-0.70	0.32
4	R079104	1.22	1.17	0.22
5	R079105	1.09	-0.19	0.19
6	R079106	0.36	1.07		0.08	0.26	-0.34
7	R079107	0.60	0.49
8	R079108	1.06	0.38	0.26
9	R079109	1.04	-1.07	0.30
10	R079110	0.52	1.00		0.12	-0.12
11	R079111	0.85	-0.19

Last updated 05 December 2023 (SK)

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​​​NAEP Technical DocumentationIRT Parameters for Items in the Informational Subscale, Grade 12 Reading National Assessment, by Block and Item: 2019

NAEP Technical DocumentationIRT Parameters for Items in the Informational Subscale, Grade 12 Reading National Assessment, by Block and Item: 2019