Veteran editors

How did you define veteran editor? I'm trying to understand what's actually being plotted. Thanks!

I defined veteran editor as 'editor that was still active at least 12 months after first editing Wikipedia.' which IMO is a fairly 'fair' definition. I've got some data for 6 months and 24 months too, but 24 months isn't properly showing the plateau (yet). For the 2005 mark it's the number of retained editors for 12 months from the jan 2004 tranche, for the 2005.25 mark it's the number of editors retained for 15 months from the jan 2004 trance + the number of editors retained for 12 months from the april 2004 trance, etc. etc.