Google Analytics Filter--Need to Return Null Values Only

Question

I am trying to query Google Analytics and include only the results from users who are not logged in.

I am storing the User-ID in a custom dimension and I can filter by that custom dimension just fine (ga:dimension3==SOMEID)

I presume that the User-ID is null for users who are not logged in (let me know if this is a bad assumption).

Google's documentation doesn't explain how to filter by null values only:

https://developers.google.com/analytics/devguides/reporting/core/v3/reference#filters

Is it possible to filter out all non-null values?

question from:https://stackoverflow.com/questions/66054307/google-analytics-filter-need-to-return-null-values-only

Answer 1

You can filter in Analytics only something that has a value (at least (not set)), you can for example send a custom dimension like loggedIn or loggedOut if the user is logged in or not and filter with those two strings, but if you only send loggedIn you can't get the loggedOut results because it is something that is not there.