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When I chart my weekly Unique users (iOS native app), grouped by userID I see that ~20% of users each week have a UserID of null.
 

 

 

 

1. What is UserID? I thought it was Amplitude ID, which should always have a value…

2. Why is it null for ~20% of weekly users?

 

Notes:

  • We use Segment to collect data and stream it through to Amplitude
  • We identify all events with a unique system user ID
  • We get 1000 new users a week so significantly less than the 1500 above with null userID
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