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#ask-questions
Title
# ask-questions
f

fast-continent-33282

03/22/2023, 1:57 PM
Hi @fresh-football-47124 and @helpful-application-7107 I have a experiment running with 100% traffic allocated to it. I want to run another experiment in parallel to the current but i want to avoid interactions between different experiment. I understand that i can use namespace but do you think enabling namespace for the another experiment that i want to run would avoid any interaction
h

helpful-application-7107

03/22/2023, 2:37 PM
Namespaces only work if you assign less than 100% traffic. There's no way to create a namespace that will only bucket new traffic between the two experiments. You'll have to restart and rebucket all users in both experiments with less traffic and both in a namespace if you want to run them in parallel.
f

fast-continent-33282

06/11/2023, 10:35 AM
@helpful-application-7107 how can we run holdout experiment in growthbook?
h

helpful-application-7107

06/13/2023, 8:34 AM
We don't have explicit support for holdouts but are building the framework necessary to support them. Can I ask what your use case is?
f

fast-continent-33282

06/23/2023, 1:40 PM
@helpful-application-7107 we are trying to run experiments on some group of users which are already divided into two groups (control and treatment) . We do not want Growthbook to do randomisation for us. We want to use GB for metrics estimations. Does GB supports such experiment?
h

helpful-application-7107

06/27/2023, 5:10 PM
Yes, you can use that, you just have to define the timestamps, the ids, and the variation id in a specific
Experiment Assignment Query
in your datasource to pull that list of IDs and the relevant timestamp from your data warehouse.
b

brave-dress-50667

09/07/2023, 8:35 PM
@helpful-application-7107 Hi, I found this thread searching for info about holdout groups! Just curious if there's a timeline on the shipping the framework that you mentioned. We're looking to create a long term holdout group to exclude from multiple experiments, and I was exploring namespaces as one possible solution, but doesn't look like that will work.
h

helpful-application-7107

09/07/2023, 8:45 PM
I don't think it's likely to land until closer to the end of the year/early next year. We have more and more of the back-end in place for them but aren't ready to roll it out yet. There is a pretty manual way to get close to something like an overall holdout group that I was just sketching out, but it hasn't been tested out before and it requires a lot of manual work so there's lots of room for user error (all stuff our eventual holdout feature would manage for you).
b

brave-dress-50667

09/07/2023, 8:49 PM
Got it, thanks! It's helpful to have that general timeline.
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