NAEP Technical DocumentationIRT Parameters for Items in the Univariate Scale, Age 9 Mathematics Long-Term Trend National Assessment, by Block and Item: 2022

IRT parameters for items in the univariate scale, age 9 mathematics long-term trend national assessment, by block and item: 2022
Item	NAEP ID	a	b	c
Not applicable; c parameters are not estimated for the two-parameter logistic model.
For item j, a represents the discriminatory power of the item, b represents a location parameter related to item difficulty, and c represents the guessing parameter. The c parameter value is assumed to be exactly zero and is not estimated for items scaled with the two-parameter logistic model.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2022 Mathematics Long-Term Trend Assessment.
Block M1
1	N332001	1.412	-0.871	0.306
2	N331101	1.164	0.113	0.105
3	N331301	0.720	-2.522	0.296
4	N331701	1.231	-0.039
5	N331702	0.983	0.388	0.245
6	N330701	1.733	-0.406	0.239
7	N329501	0.788	-0.286
8	N358001Z	0.518	-0.405	0.262
9	N331001	1.320	-0.146	0.231
10	N329201	0.729	0.055
11	N330001	0.471	-0.615	0.172
12	N331501	0.870	-0.026
13	N332301	1.154	0.668	0.374
14	N330601	1.391	0.609	0.157
15	N329101	0.722	-0.782
16	N331601	0.747	-1.520
17	N332901	1.279	-0.329	0.281
18	N331801	1.798	-0.069	0.176
19	N331901	1.468	0.965
20	N330101Z	0.905	1.584	0.209
21	N330102	1.218	1.451	0.264
22	N330901	1.559	0.483	0.210
23	N332101	1.285	0.011
24	N328901	1.723	-0.233	0.133
Block M2
1	N293901	1.269	-1.228	0.092
2	N294001	0.910	-1.863	0.188
3	N294101	0.880	-1.583	0.232
4	N294201	0.678	-2.934
5	N294301	1.140	-0.834
6	N294401	0.883	0.122	0.224
7	N294501	1.036	-0.059	0.144
8	N294601	1.444	-0.004	0.157
9	N294701Z	0.340	-1.241	0.155
10	N294801	1.456	1.680	0.141
11	N294901	0.809	0.052	0.200
12	N295001	0.888	-1.304	0.172
13	N295101	1.526	0.082	0.254
14	N295201	1.395	0.037	0.158
15	N295301	1.167	-1.012
16	N295401	1.016	-0.730
17	N295501	1.674	0.305	0.243
18	N295601	0.975	-0.874	0.184
19	N295701	1.249	0.589
20	N295801	1.155	0.493	0.233
21	N295901	1.423	1.411	0.084
22	N296001	1.091	0.657	0.308
23	N296101	1.181	0.653	0.276
Block M3
1	N322001	0.637	-2.328	0.238
2	N322101	0.537	-0.589	0.171
3	N322201	1.053	-0.654	0.164
4	N322301	0.997	-1.145	0.289
5	N322401	0.865	-0.037
6	N322501	1.541	0.996	0.131
7	N322601	1.045	-0.815	0.148
8	N322602	1.423	1.619	0.091
9	N322701	0.324	0.064	0.172
10	N322801	0.253	-3.079	0.218
11	N322901Z	0.628	-0.485	0.194
12	N323001Z	1.027	-0.044	0.164
13	N323101	1.074	-0.412
14	N323201	1.230	-1.284	0.156
15	N323301	1.534	0.648	0.226
16	N323401	1.139	-1.232	0.305
17	N323501	0.499	0.923	0.224
18	N323601	1.108	0.089	0.304
19	N323701	0.959	-0.777
20	N323801	1.375	0.687	0.159
21	N323901	1.169	-0.620
22	N324001	1.149	-0.503
Block M4
1	N312401	1.314	-1.355	0.141
2	N312501	1.459	-0.378	0.197
3	N312601	0.839	-1.080	0.214
4	N312801	0.937	-1.283	0.442
5	N312901	0.996	-1.295
6	N313001	0.787	-1.209
7	N313101	1.112	-0.581
8	N313102	1.042	0.218
9	N313103	1.008	0.027
10	N313201	0.632	-0.673	0.163
11	N313301	1.282	-1.411	0.166
12	N313302	0.644	-1.163	0.115
13	N313303	1.251	-0.186	0.097
14	N313401	0.959	-0.834	0.090
15	N313501	0.713	-0.886	0.065
16	N313502	1.049	0.318	0.111
17	N313503	1.437	-0.412	0.128
18	N313601	1.604	0.661	0.407
19	N313701	1.212	-0.562
20	N313702	1.268	0.396
21	N313801	0.858	-0.706
22	N313901	1.027	-0.782
23	N314001	1.701	1.086	0.216
24	N314101	1.067	0.786	0.137
Block M5
1	N287401	1.482	0.205	0.165
2	N287501	1.363	-0.580	0.083
3	N287601	1.099	0.721
4	N287701	0.883	-1.178	0.267
5	N287801	0.858	-1.670	0.120
6	N287901	0.966	-1.543	0.295
7	N288001	1.273	0.068	0.143
8	N288101	0.778	0.017
9	N288201	1.787	0.851	0.310
10	N288301	0.921	-1.147	0.202
11	N288401	1.147	-0.453	0.338
12	N288501	1.026	-0.609
13	N288601	1.419	0.043	0.119
14	N288701	1.187	-1.109	0.242
15	N288801	1.143	1.224	0.244
16	N288901	0.960	-0.203	0.229
17	N289001	1.466	0.351	0.204
18	N289101	1.661	0.374	0.148
19	N289201	1.254	-0.354
20	N289301	1.218	1.006	0.335
21	N289401	0.687	-0.334	0.262
Block M6
1	N289501	0.725	-1.379	0.223
2	N289601	1.136	-1.121	0.442
3	N289701	1.198	-0.652
4	N289801	0.979	-1.180	0.324
5	N289901	0.710	-1.720
6	N290001	0.885	-0.435	0.187
7	N290101	0.988	0.306
8	N290201	1.401	0.236	0.125
9	N290301	2.696	1.232	0.151
10	N290401	0.749	-0.649	0.132
11	N290501	0.674	-1.048	0.226
12	N290601	1.175	-0.332	0.309
13	N290701Z	0.310	-2.774
14	N290801	1.150	0.575	0.097
15	N2909CL	0.618	2.668
17	N291101	1.126	0.318	0.384
18	N291201	1.494	-0.057	0.194
19	N291301	0.645	1.278	0.313
20	N291401	1.050	0.384	0.257
21	N291501	0.544	1.557

Last updated 24 July 2024 (SK)

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​​​​​​​​NAEP Technical DocumentationIRT Parameters for Items in the Univariate Scale, Age 9 Mathematics Long-Term Trend National Assessment, by Block and Item: 2022

NAEP Technical DocumentationIRT Parameters for Items in the Univariate Scale, Age 9 Mathematics Long-Term Trend National Assessment, by Block and Item: 2022