Would anyone have/know where to find any of the following estimates for English Wikipedia, either as a number or as % of the total population of editors (which is known):
* of people who edited Wikipedia anonymously
* of Wikipedians with a userpage
* of Wikipedians who have been registered for less than a year
* of Wikipedians who have been registered for less than a month
The data does not have to be current.

--
Piotr Konieczny

"To be defeated and not submit, is victory; to be victorious and rest on one's laurels, is defeat." --Józef Pilsudski