12 August 2022

There was an error in the previously published data for Quarter 3 (July to Sept) 2020 in which a small number of cases were excluded from the analysis. This happened because of human error. However, this did not impact the seasonal adjustment model overall. We apologise for any inconvenience caused.

This error has been corrected in the October 2021 to March 2022 edition, in addition to methodological improvements including reweighting on the latest population estimates.

30 August 2024

Each year we undertake a seasonal adjustment review incorporating an extra years’ data to ensure our adjustments remain accurate.

At the start of 2024 we undertook the latest review, incorporating data to January to March 2024. As a consequence, new seasonal adjustments were calculated, and have now been applied to the back series as of 29 August 2024.