Analytics: What is an "Active User"?

In our current analytics release how do we define this stat:

Existing Release

  1. Traffic :

a. Number of Active Users over time
b. Unique Visits by Role Type
c. Page Views over Time
d. New Users over Time

  1. Posting

. New Discussions over Time

a. New Comments over Time
b. New Posts (Discussion + Comments) over Time
c. Posts by Type (filter)
d. Posts by Category (filter)
e. Post by Role Type (filter)

  1. Engagement

. Post Positivity Rate

a. Average Time to First Comment
b. Visits per Active User
c. Average Posts per Active User
d. Average Comments per Discussion

  1. Q&A

. Questions Asked over Time

a. Questions Answered over Time
b. Answers Accepted over Time
c. Average Time to Answer
d. Average Time to Accept

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