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

Question

User ID = (none)

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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