Hi I need to split the result of an AB test by new or alread

Question

Hi I need to split the result of an AB test by new or already existing users My metric is Retention D7 so I use `conversion delais` and `conversion windows` I am able to know if a user is new at the moment he enters the AB test but I lose this info as days goes on How can I create a dimension based on an information I have only when the user enters the experiment What s the behavior of `dimension columns` when the user have multiple exposures events and the dimension value changes Any help would be greatly appreciated pray

thankful-vr-57553 · Answer

I might have found my answer <https docs growthbook io app dimensions|in the doc> ``` we can always know the dimension that is associated with the first experiment exposure for a unit``` So if I flag my user as a new user using a dimension at its first exposure it will be considered new when I split the test results for the whole test duration is that right

fresh-football-47124 · Answer

Correct

fresh-football-47124 · Answer

There might be some nuances with the SQL depending on the date of expsure and how you define that dimension