https://github.com/Daniel-Pailanir/sdid
https://github.com/chaisemartinPackages/did_multiplegt
https://github.com/borusyak/are213
https://github.com/chaisemartinPackages/did_multiplegt_dyn
https://github.com/chaisemartinPackages/twowayfeweights
https://github.com/Mixtape-Sessions/Heterogeneous-Effects/
https://github.com/Mixtape-Sessions/Causal-Inference-3
https://github.com/chaisemartinPackages/did_multiplegt_stat
https://github.com/JMSLab/xtevent
https://github.com/Mixtape-Sessions/Advanced-DID
