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# ask-questions
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rhythmic-chef-84815

02/20/2024, 10:12 AM
I would like to have some help to understand sticky bucketing better, after reading the information here https://docs.growthbook.io/app/sticky-bucketing, I got a bit confused because in the introduction it says
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(1) Bucketing based on either a primary hash attribute (i.e. user id) or a secondary attribute (i.e. anonymous id) and (2) the ability to version-control and purge your users' assigned buckets.
but when checking the implementation it is using cookies so now I am wondering why exactly does it need cookies if it is based on the id for example. How does it really work?
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