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Function to compute the delta ATT. For more details on the methodology, see: Bellego, Benatia, and Dortet-Bernadet (2024), "The Chained Difference-in-Differences", Journal of Econometrics, https://doi.org/10.1016/j.jeconom.2023.11.002.
gmm_compute_delta_att(dp)
a DIDparams object
DIDparams
a dp object