What is resurrection and how is it calculated?

Resurrection (in the context of retention) is a metric that shows how many users returned to the product after a period of inactivity.

How to calculate resurrection:

1. Define the period of inactivity (for example, the user did not log in for 7 days).
2. Identify users who were active, then absent during this period.
3. Count how many of them returned and became active again after this period.

Formula:

Resurrection Rate = (Number of users who returned after the inactivity period) / (Number of users who left during this period) * 100%

Example: if 100 users stopped logging in for 7 days, and 20 of them returned after that — the resurrection rate will be 20%.

This metric helps understand how capable the product is of bringing back users who temporarily stopped using it.