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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Reading Long-Term Trend Assessment IRT Parameters → IRT Parameters for Items in the Univariate Scale, Age 9 Reading Long-Term Trend National Assessment, by Block and Item: 2022
NAEP Technical DocumentationIRT Parameters for Items in the Univariate Scale, Age 9 Reading Long-Term Trend National Assessment, by Block and Item: 2022
| 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. | ||||||||
| 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 Reading Long-Term Trend Assessment. | ||||||||
| Block R1 | ||||||||
| 1 | N021101 | 2.004 | 0.108 | 0.251 | ||||
| 2 | N021102 | 1.625 | -0.281 | 0.275 | ||||
| 3 | N021201 | 2.167 | 0.000 | 0.311 | ||||
| 4 | N021202 | 1.115 | 1.409 | 0.196 | ||||
| 5 | N021203 | 0.521 | 0.204 | 1.290 | -0.108 | -1.181 | ||
| 6 | N021301 | 1.837 | 0.141 | 0.211 | ||||
| 7 | N021302 | 2.617 | 1.040 | 0.122 | ||||
| 8 | N021303 | 1.439 | 1.080 | 0.196 | ||||
| Block R2 | ||||||||
| 1 | N021401 | 0.521 | 0.295 | 0.265 | ||||
| 2 | N021402 | 0.904 | 0.522 | 0.160 | ||||
| 3 | N021403 | 1.836 | 1.254 | 0.210 | ||||
| 4 | N021501 | 2.202 | 0.093 | 0.299 | ||||
| 5 | N021502 | 1.330 | 0.286 | 0.249 | ||||
| 6 | N021503 | 1.315 | -0.363 | 0.172 | ||||
| 7 | N021601 | 1.579 | -0.287 | 0.300 | ||||
| 8 | N021602 | 0.991 | 0.394 | 0.342 | ||||
| 9 | N021603 | 0.987 | 0.980 | 0.227 | ||||
| 10 | N021701 | 1.372 | -0.848 | 0.213 | ||||
| Block R3 | ||||||||
| 1 | N021801 | 1.217 | -0.025 | 0.334 | ||||
| 2 | N021802 | 0.780 | 1.274 | 0.305 | ||||
| 3 | N021803 | 0.609 | 0.111 | 1.591 | -1.591 | |||
| 4 | N022001 | 1.709 | -0.108 | 0.230 | ||||
| 5 | N022002 | 1.426 | -0.211 | 0.188 | ||||
| 6 | N022003 | 1.342 | 0.317 | 0.389 | ||||
| 7 | N022004 | 2.244 | -0.164 | 0.267 | ||||
| Block R4 | ||||||||
| 1 | N022101 | 1.857 | -0.142 | 0.337 | ||||
| 2 | N022102 | 3.160 | 0.908 | 0.191 | ||||
| 3 | N022103 | 0.788 | 1.262 | 1.868 | -0.300 | -1.568 | ||
| 4 | N022201 | 1.388 | 0.822 | 0.378 | ||||
| 5 | N022202 | 1.598 | -0.473 | 0.216 | ||||
| 6 | N022203 | 1.332 | 0.044 | 0.196 | ||||
| 7 | N022204 | 1.882 | 0.490 | 0.219 | ||||
| 8 | N022205 | 2.191 | 0.510 | 0.194 | ||||
| Block R6 | ||||||||
| 1 | N022701 | 1.174 | -0.349 | 0.314 | ||||
| 2 | N022702 | 1.814 | -0.128 | 0.244 | ||||
| 3 | N022703 | 1.709 | -0.542 | 0.350 | ||||
| 4 | N022704 | 2.148 | -0.261 | 0.182 | ||||
| 5 | N022801 | 1.369 | -1.514 | 0.232 | ||||
| 6 | N022901 | 0.718 | -1.404 | 0.180 | ||||
| 7 | N023001 | 1.454 | 0.166 | 0.208 | ||||
| 8 | N023002 | 1.470 | 0.661 | 0.277 | ||||
| 9 | N023101 | 1.731 | 0.601 | 0.259 | ||||
| 10 | N023102 | 1.547 | 0.553 | 0.282 | ||||
| Block R7 | ||||||||
| 1 | N023301 | 1.239 | 0.151 | 0.253 | ||||
| 2 | N023401 | 0.954 | -0.415 | 0.315 | ||||
| 3 | N023402 | 1.774 | 0.198 | 0.337 | ||||
| 4 | N023403 | 0.971 | -0.416 | 0.294 | ||||
| 5 | N023501 | 1.704 | 0.072 | 0.363 | ||||
| 6 | N023502 | 1.326 | -0.056 | 0.236 | ||||
| 7 | N023601 | 1.608 | -0.229 | 0.332 | ||||
| 8 | N023602 | 0.988 | -0.906 | 0.216 | ||||
| Block R8 | ||||||||
| 1 | N033801 | 0.772 | -1.150 | 0.253 | ||||
| 2 | N033803 | 0.960 | -1.235 | 0.256 | ||||
| 3 | N033901 | 1.264 | 0.048 | 0.249 | ||||
| 4 | N033902 | 1.737 | 0.032 | 0.240 | ||||
| 5 | N033903 | 2.243 | 0.239 | 0.157 | ||||
| 6 | N030001 | 1.326 | 0.187 | 0.156 | ||||
| 7 | N030002 | 2.077 | 0.064 | 0.258 | ||||
| 8 | N034101 | 2.316 | -0.318 | 0.273 | ||||
| 9 | N034102 | 2.045 | -0.406 | 0.312 | ||||
| Block R9 | ||||||||
| 1 | N028601 | 1.922 | -0.734 | 0.245 | ||||
| 2 | N028602 | 1.921 | -0.564 | 0.284 | ||||
| 3 | N028701 | 1.667 | -0.219 | 0.360 | ||||
| 4 | N028702 | 1.472 | -0.118 | 0.232 | ||||
| 5 | N028703 | 1.301 | -0.078 | 0.261 | ||||
| 6 | N028704 | 1.874 | -0.571 | 0.277 | ||||
| 7 | N028801 | 1.084 | 0.209 | 0.194 | ||||
| 8 | N028802 | 0.776 | 0.223 | 0.228 | ||||
| 9 | N028901 | 1.206 | 0.318 | 0.308 | ||||
| 10 | N028902 | 1.769 | 1.096 | 0.219 | ||||
| Block R10 | ||||||||
| 1 | N027001 | 2.074 | -0.442 | 0.195 | ||||
| 2 | N027002 | 1.613 | -0.179 | 0.247 | ||||
| 3 | N027003 | 1.212 | -0.866 | 0.179 | ||||
| 4 | N027101 | 1.662 | 0.143 | 0.245 | ||||
| 5 | N027102 | 1.300 | 0.012 | 0.293 | ||||
| 6 | N027201 | 1.357 | 0.203 | 0.117 | ||||
| 7 | N027202 | 1.549 | -0.260 | 0.235 | ||||
| 8 | N027203 | 1.990 | 0.371 | 0.216 | ||||
Last updated 24 July 2024 (SK)