Stickiness = Daily Active Users / Monthly Active Users
S = DAU/MAU
It asks, "Of the members who were active in the last 30 days, how many are active today?"
I love that it removes inactives and focuses on the depth of engagement amongst your active members.
One of the best ways to grow community engagement is to ask for feedback, take it seriously, and act upon it with excitement. The feedback loops and demonstration of it do wonders for investment from members.
TLDR: If you truly give a damn, they will too