Aaron Halfaker, 22/03/2017 22:43:
__· __Number of editors who contribute 1 edit per month? __
First column of https://stats.wikimedia.org/EN/TablesWikimediaAllProjects.htm .
__· Is it possible/feasible to run editor retention metrics globally (versus just based on a single project?
This depends if one just wants to (deduplicate and) sum different projects, or also consider interwiki events (such as a person stopping activity on a wiki but resuming activity on another wiki). I remember something was done a few years ago to see if Wikidata removed active editors from other projects and a few "migration" paths were identified in all directions. I can't find the chart/table now though.
__· __Total number of editors on all projects over the past 16 years (not just ENWP)?____
For a quick estimate I usually make a proportion https://stats.wikimedia.org/EN/TablesWikipediaEN.htm#editor_activity_levels : https://stats.wikimedia.org/EN/TablesWikimediaAllProjects.htm ~ https://stats.wikimedia.org/EN/TablesWikipediaEN.htm#editdistribution : x . If the active editors in most classes are about 1 : 2, then probably the total number of editors in all Wikipedias + all other project is more than twice the English Wikipedia's total e.g. over 10 millions (or over 2 millions if you consider the usual 10 edits threshold).
__· __Global distribution of editors by region (or country), 2016
https://web.archive.org/web/20161024063241/https://stats.wikimedia.org/wikim... + https://web.archive.org/web/20161002042707/https://stats.wikimedia.org/wikim... ?
Nemo