How Assembly scaled score equivalents are generated

Summary

Your Attainment dashboard shows key assessment measures for your school and MAT, using data from PUMA and PiRA tests offered by RS Assessment from Hodder Education. This article explains how we receive and process this data to produce scaled score equivalents. For an explanation of how this data is displayed on your dashboard, please see this support article

Standardised Scores

In order to produce your attainment dashboard, Assembly starts by receiving standardised scores from PIRA and PUMA (either via the Mark gradebook or your MIS). For more information about standardised scores and how they differ from scaled score equivalents, please read this support article

Converting Standardised Scores to Scaled Score Equivalents

Once Assembly has received standardised scores for each pupil, they can easily be converted to a percentile rank:

The percentiles ranks can then be used to generate a scaled score equivalent. To do so we look at the DfE's latest release of KS2 SATs data, download the National tables: SFR69/2017 file, and use the tab named Table_N2b

Here, we're able to see a distribution of what percentage of students achieved each scaled score in the most recent KS2 SATs:

We stretch out the distribution to ensure that every percentile rank has a scaled score equivalent. We're then able to use that percentile rank to generate a scaled score equivalent for each student:

To read about how these scaled score equivalents are displayed in your dashboard, please see this support article

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