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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 Measurement Subscale, Grade 8 Mathematics Combined National and State Assessment, by Block and Item: 2022
NAEP Technical DocumentationIRT Parameters for Items in the Measurement 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 | ||||||||
| 1 | M252301 | 0.727 | -2.211 | 0.188 | ||||
| 14 | M3816CL | 0.450 | 0.784 | 0.729 | -0.003 | -3.667 | 2.942 | |
| Block M2 | ||||||||
| 2 | M383501 | 0.696 | 0.600 | 0.176 | ||||
| 7 | M382902 | 0.484 | 0.520 | 0.416 | -0.416 | |||
| 14 | M3810MS | 1.168 | 0.207 | |||||
| Block M3 | ||||||||
| 8 | M3797MS | 0.431 | -0.466 | -1.337 | 1.337 | |||
| 10 | M251601 | 1.132 | 0.277 | 0.090 | ||||
| 15 | M4086CL | 0.695 | 1.087 | 0.389 | -0.139 | -0.214 | -0.036 | |
| Block M4 | ||||||||
| 2 | M3519CL | 0.765 | 0.060 | -0.458 | 0.458 | |||
| 4 | M353001 | 0.551 | 0.889 | 0.295 | ||||
| Block M5 | ||||||||
| 2 | M222501 | 1.054 | 0.209 | 0.194 | ||||
| 9 | M223201 | 1.099 | 1.709 | 0.280 | ||||
| 20 | M234601 | 1.183 | 0.220 | 0.099 | ||||
| Block M6 | ||||||||
| 5 | M121801 | 0.655 | 0.410 | 0.391 | ||||
| 13 | M167301 | 1.357 | 0.789 | 0.189 | ||||
| Block M7 | ||||||||
| 2 | M231401 | 0.823 | 0.752 | 0.416 | ||||
| 6 | M233101 | 1.128 | -0.375 | 0.223 | ||||
| 13 | M339601 | 0.803 | 0.567 | 0.208 | ||||
| 20 | M152401 | 1.060 | 0.858 | 0.064 | ||||
| Block M8 | ||||||||
| 4 | M3878MS | 1.291 | -0.076 | |||||
| 14 | M3899MS | 0.227 | 7.198 | |||||
| Block M9 | ||||||||
| 1 | M253101 | 1.072 | -1.587 | 0.194 | ||||
| 6 | M4199MS | 0.584 | -0.094 | |||||
| 15 | M413701 | 1.124 | 3.301 | |||||
| 17 | M411901 | 1.000 | 2.023 | -0.340 | 0.340 | |||
| Block M10 | ||||||||
| 8 | M237601 | 1.050 | -0.354 | 0.217 | ||||
| 20 | M236401 | 0.919 | -0.655 | 0.210 | ||||
| Block M11 | ||||||||
| 4 | M3850MS | 0.621 | -1.825 | 0.494 | -0.494 | |||
| 6 | M4043MS | 0.395 | -1.267 | -1.120 | 1.120 | |||
| Block M12 | ||||||||
| 4 | M248501 | 0.610 | -1.850 | |||||
| 6 | M249201 | 1.670 | -0.619 | 0.151 | ||||
| 9 | M4029MS | 0.952 | 0.042 | |||||
| Block M13 | ||||||||
| 1 | M412101 | 0.880 | -1.237 | 0.138 | ||||
| 8 | M408701 | 1.162 | -0.060 | 0.169 | ||||
| 17 | M412301 | 0.808 | 2.409 | -1.314 | 1.314 | |||
| Block M14 | ||||||||
| 6 | M251201 | 0.944 | -0.615 | |||||
| 13 | M407701 | 0.664 | 1.310 | 0.366 | ||||
Last updated 24 July 2024 (SK)