https://bugzilla.wikimedia.org/show_bug.cgi?id=53118

       Web browser: ---
            Bug ID: 53118
           Summary: Large drop in historical total active editors numbers
           Product: Analytics
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: Unprioritized
         Component: Wikistats
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
    Classification: Unclassified
   Mobile Platform: ---

The "Total" active editor numbers for past months on the report card [1]
("Active Wikimedia Editors for All Wikimedia Projects (5+ edits per month)")
appear to have changed drastically at some point during the last few months. 


Compare the table with the same numbers on stats.wikimedia.org [2] with its 
version as archived by the Internet Archive in May [3]. E.g.:


March 2013:  79346 (current) vs. 82105 (archived, also matches the number given
in the monthly WMF report at the time [4])

February 2013:  75140 (current) vs. 77701 (archived)

...

June 2012:  77363 (current) vs. 78320 (archived)

...


Note that some shrinkage is expected because of page deletions, but these
decreases are way too large to be explained by this effect.


Also, two smaller issues which might be related or not: 

* For some reason, the source CSV file linked in the report card [5] contains
empty columns for several other language projects (e.g. Chinese, Portuguese,
and Polish Wikipedia, and Meta-Wiki), apart from those included in the charts.

* The June 2013 number for the Italian Wikipedia is currently missing from the
report card chart ("NaN"). 


----

[1] http://reportcard.wmflabs.org/graphs/active_editors

[2] http://stats.wikimedia.org/EN/TablesWikimediaAllProjects.htm (Edits ≥ 5
column)

[3]
http://web.archive.org/web/20130521103812/http://stats.wikimedia.org/EN/TablesWikimediaAllProjects.htm
(Edits ≥ 5 column)

[4]
https://meta.wikimedia.org/wiki/Wikimedia_Foundation_Report,_April_2013#Data_and_Trends

[5] http://reportcard.wmflabs.org/data/datafiles/rc/rc_active_editors_count.csv

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