Hi Federico,

The data we have from active editors in 2015 is taken from a snapshot and uses the same filters and logic as the data for 2020. More about our definitions, as well as a link to the code we use to calculate the metrics, available here: https://www.mediawiki.org/wiki/Wikimedia_Product/Data_glossary#Editors

Warm regards,

On Thu, Apr 29, 2021 at 11:31 PM Federico Leva (Nemo) <nemowiki@gmail.com> wrote:
Thanks Kate for the update!

Il 30/04/21 02:08, Kate Zimmerman ha scritto:
> [...] active editors increased 18 percent, not 36 percent[3,5]. [...]
> [3] December 2020 content interactions and active editor data from
> https://commons.wikimedia.org/wiki/File:December_2020_Wikimedia_movement_metrics.pdf [...]
> [5] December 2015 active editor data from an internal query across all
> Wikimedia sites, showing 79,420 active editors

What kind of internal query? You can't compare active editor numbers
calculated with different methods. For instance, you need to have the same:
* content pages selection,
* user activity thresholds,
* global users aggregation/deduplication,
* exclusion of bots,
* seasonality corrections,
* and crucially, distance from the observed period.

December 2020 data is less than 4 months old, so the active editor
figures for the month will keep decreasing for a while until deletion
activity is mostly done for the period. If you want to compare it to
December 2015 data, you'd need to use the same method and run it against
a snapshot of the data taken in April 2016.

Best regards,