NAEP Technical DocumentationComparison of Means and Percentiles of Scores and Transformed Provisional Scores, Grade 8 Reading Combined National and State Assessment, by Scale: 2017

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.

In 2017, both a paper-based assessment (PBA) and a digitally based assessment (DBA) were administered. The provisional PBA estimates were transformed based on the procedures described above. Then a common population linking was used to align the 2017 paper-based assessment results with the 2017 digitally based assessment results.

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