Number of people who gave answers
While all of your other questions can be answered if someone has access to the database (assuming no data was lost overtime), I wonder how one would measure this. A lot of replies aren't answers. Some of those replies don't even attempt to answer. Sometimes, there are replies to nodes that do not contain a question.

This reply for instance, is not an answer.

In reply to Re: Statistics about PerlMonks by JavaFan
in thread Statistics about PerlMonks by szabgab

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