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Technowatermelon. Elder Millenial. Building Farcaster. 

nf.td/varun

@dwr.eth @v how do you exactly calculate d30 retention? what is the definition of a "retained" user that i can use in my analytics? do you measure by daily, weekly or other cohorts?

customer support @supercast

trying to sound smart /doingnumbers

Someone who signed up on day 1 and logged in again on day30

do you average that over some period or "my d30 retention is 20%" means that 20% of the users who signed up exactly 30 days ago logged in today?

why using logging in instead of some more complex action like reaction or a post?

Amplitude has a nice tool that averages over a time period. 

You can pick anything you like, some are tougher to move than others

Short answer is because it gives the biggest number and is industry standard. You can do whatever you like though. But anyone will take “my d30 is 50%” as what @v said.