The question can't really be answered without knowing what you want to
achieve; I'll start from the end.
WereSpielChequers, 28/08/2013 14:13:
This is of more than academic interest, if we simply
ignore this effect and
make decisions based on the remaining raw edits after the edit filter, then
the more efficient the edit filter gets at preventing vandalism the more we
would be beating ourselves up for losing edits.
Usually we consider the number of active users, which is less affected
by this. Editing activity should be measured using
http://stats.wikimedia.org/EN/PlotsPngEditHistoryAll.htm which allows to
check for unreverted edits (just updated by Erik after a few years it
had been dormant).
If your aim is measuring the impact AbuseFilter in reducing patrolling
efforts, then it's another matter. I've requested some reports in
https://bugzilla.wikimedia.org/show_bug.cgi?id=42359 : there are already
some DB queries but we lack a visualisation.
You can also use
https://meta.wikimedia.org/wiki/Abuse_filter to find
what wikis used (or not) the abuse filter and how, before it was enabled
by default on all wikis.
Nemo