Where can I find this information? what is the definition of an "active
user"? thanks! Good question, Jessie. I looked at the page Mariya put together-- https://meta.wikimedia.org/wiki/Research:Data--but I couldn't find it there.
You can find it here: http://www.mediawiki.org/wiki/Analytics/Metric_definitions and "active user" should say "active editor". D