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NAEP Technical DocumentationComparisons of Means and Percentiles of Scores and Transformed Provisional Scores, Age 9 Reading Long-Term Trend National Assessment: 2020
Original estimates are based on previous assessment data and previous assessment scaling results, transformed to the reporting metric using the transformation identified during the analysis of the previous assessment data. Provisional estimates are based on previous assessment data and current assessment scaling results. These are on the theta metric specified by the scaling program. The original and provisional estimates for the linking sample are used to find the transformation constants necessary to place the current assessment scale scores on the scale used to report previous assessment scale scores. The transformed provisional estimates are based on previous assessment data and current assessment scaling results, transformed to the reporting metric using the transformation constants calculated from the original and provisional estimates for the linking sample. If the transformation constants are correct, the original and transformed provisional means should be the same.
| Statistic | Original 2012 estimate | 2012-transformed provisional estimate | Difference between the provisional estimate and the original estimate |
|---|---|---|---|
| Rounds to zero. | |||
| The differences are based on the unrounded estimates. | |||
| U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2012 and 2020 Reading Long-Term Trend Assessments. | |||
| Univariate scale | |||
| Mean | 220.76 | 220.76 | |
| 10th percentile | 170.78 | 170.97 | 0.19 |
| 25th percentile | 198.69 | 198.53 | -0.16 |
| 50th percentile | 224.38 | 224.10 | -0.28 |
| 75th percentile | 246.41 | 246.54 | 0.13 |
| 90th percentile | 265.53 | 265.86 | 0.33 |
Last updated 28 March 2024 (SK)