Understanding control and test split

[ar-asur]

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Hi team,

I am trying to use GeoLift package for a particular test design and would like to understand if it is possible and any suggestions. I am planning to run few incrementality tests on marketing channels. I would like to split the US states into test and control (possibly 3 groups). I understand it is possible with the package to get specific number of control groups with matching test groups. My question is How do I make sure that both groups mimic the whole US? I want to extend the results/insights to national level. Thanks!