It is based on measures of progress for mats with 3 or more academies that have been with the mat for at least 3 full academic years and have results in the 2017 school performance tables.
Mat performance tables.
The dfe has published statistics on the performance at key stage 4 of state funded mainstream schools in multi academy trusts in england.
For example knowing a mat had a progress 8 score of 0 2 in 2018 and a score of 0 2 in 2019 tells you how the mat compared to the national average in those years but not whether its performance improved across years.
Where a mat is a part of a larger sponsor arrangement results are presented under the sponsor rather than the individual multi academy trust.
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These statistics are based on measures of progress for mats with three or more academies that have been with the mat for at least three full academic years and have results in the 2019 school performance tables.
Table 1 multi academy trusts at key stage 2.
Please take care when drawing conclusions about a mat s improvement or fall in performance based on progress 8 alone.