Est pop patch

[JulinaM]

Confirm the logic w/ @ehudkr.

• i.e. individual outcome averaged to get the pop outcome as a Default Case for now.
• Backlog: Support for multiple treatment strategies. Like a list of "always_treated" and "never_treated".

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:x: julinamaharjan
:x: pchakraborty1
:x: prithwi

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