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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for Items in the Geometry Subscale, Grade 8 Mathematics Combined National and State Assessment, by Block and Item: 2022
NAEP Technical DocumentationIRT Parameters for Items in the Geometry Subscale, Grade 8 Mathematics Combined National and State Assessment, by Block and Item: 2022
| 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. | ||||||||
| 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), 2022 Mathematics Assessment. | ||||||||
| Block M1 | ||||||||
| 7 | M4196MS | 1.007 | -0.229 | |||||
| 9 | M3884MS | 1.100 | 0.182 | |||||
| 12 | M409501 | 1.145 | 1.478 | |||||
| 15 | M4197MS | 0.371 | 1.845 | 1.116 | -1.116 | |||
| Block M2 | ||||||||
| 5 | M3809MS | 0.747 | -1.060 | |||||
| 9 | M3846MS | 0.463 | 0.762 | -0.167 | 0.167 | |||
| 13 | M3800MS | 0.564 | 1.743 | -0.098 | 0.098 | |||
| Block M3 | ||||||||
| 2 | M251401 | 0.928 | -1.524 | |||||
| 5 | M405701 | 0.869 | -0.962 | 0.251 | ||||
| Block M4 | ||||||||
| 9 | M352401 | 0.962 | 0.766 | 0.161 | ||||
| 11 | M355801 | 0.761 | 1.157 | 0.076 | ||||
| Block M5 | ||||||||
| 4 | D2227MS | 0.992 | 0.224 | |||||
| 14 | M223701 | 2.106 | 1.616 | 0.180 | ||||
| 17 | M221501 | 0.852 | -0.451 | 0.286 | ||||
| Block M6 | ||||||||
| 2 | M170901 | 1.061 | -0.012 | 0.175 | ||||
| 10 | M169101 | 1.105 | 2.018 | 0.306 | ||||
| 18 | M171201 | 1.266 | 1.432 | 0.176 | ||||
| Block M7 | ||||||||
| 3 | M339501 | 1.432 | 0.040 | 0.249 | ||||
| 4 | M232001 | 0.957 | 0.699 | 0.170 | ||||
| Block M8 | ||||||||
| 7 | M3887MS | 0.506 | 0.932 | -0.513 | 0.513 | |||
| 10 | M388201 | 0.486 | 1.407 | -4.553 | 4.553 | |||
| 13 | M3873CL | 0.535 | 1.775 | -3.517 | 3.810 | -0.414 | 0.121 | |
| Block M9 | ||||||||
| 3 | M249401 | 1.101 | -0.186 | 0.222 | ||||
| 9 | M4200MS | 0.853 | 1.575 | |||||
| 12 | M4202MS | 1.397 | 0.727 | |||||
| 14 | M413101 | 0.881 | 0.887 | 1.107 | -1.107 | |||
| Block M10 | ||||||||
| 2 | M235901 | 1.350 | 0.612 | 0.090 | ||||
| 4 | M237101 | 1.566 | 1.158 | 0.259 | ||||
| 9 | M238301 | 0.814 | 0.435 | 0.052 | ||||
| Block M11 | ||||||||
| 2 | M3896MS | 0.524 | -1.819 | |||||
| 5 | D2508MS | 0.494 | -1.598 | -0.125 | 0.125 | |||
| 10 | M247801 | 1.160 | 0.016 | |||||
| 13 | M405301 | 0.516 | 1.676 | 1.356 | -1.068 | -0.288 | ||
| Block M12 | ||||||||
| 12 | M4078MS | 0.720 | 1.556 | -0.916 | 0.916 | |||
| 16 | M4041MS | 0.469 | 2.073 | 0.053 | -0.053 | |||
| Block M13 | ||||||||
| 4 | M248401 | 1.410 | -0.190 | 0.246 | ||||
| 10 | M248101 | 1.173 | -0.119 | 0.154 | ||||
| 16 | M252801 | 1.921 | 0.693 | 0.121 | ||||
| 18 | M390101 | 0.958 | 1.129 | 0.061 | ||||
| Block M14 | ||||||||
| 3 | M251801 | 1.422 | -0.439 | 0.081 | ||||
| 9 | M3843MS | 0.440 | 0.192 | -2.071 | 2.071 | |||
| 11 | M3864MS | 1.429 | 0.218 | |||||
Last updated 24 July 2024 (SK)