User Stickiness - Sprint Guide

Are my users coming back?
Acquisition metrics are often emphasized for good reason, but stickiness can 
measure repeated, consistent value being driven. This manifests itself in the 
form of re-engaged users. 
Measuring user stickiness
This is an elementary formula: DAU/MAU. this shows the percentage of your 
MAUs that engage in a daily fashion. 

Takeaway: understand what impacts this score, and scale it.