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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:

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 ?

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