I notice that some users are extremely active while many only post once. I wonder how much activity is done by the top users. How much of the answering activity was done last quarter by those 100 earning the most reputation?
Alrighty, looks like I've got the query down. I don't remember exactly where the quarter cutoffs are, but you can modify it easy enough.
This puppy just takes all answers from September 1 and on.
SELECT count(p.Id) FROM Posts p WHERE p.creationDate > '2013-09-01 00:00:00' AND p.PostTypeId = 2 AND p.OwnerUserId IN (SELECT Top 100 Id FROM Users ORDER BY Reputation DESC)
Running it (query link here) gets me
- 22924 answers from the top 100
- 73989 overall (just comment out the last line)
which gets me a percentage of ~30.98%
As pointed out by Asaf, this does "top 100 users by overall reputation". I might be able to post another query later that does "top 100 users by quarterly reputation gain", but skimming the options in Data Explorer, that won't be as simple of a query.