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pysynthdid : Synthetic difference in differences for Python

What is Synthetic difference in differences:

original paper:

Arkhangelsky, Dmitry, et al. Synthetic difference in differences. No. w25532. National Bureau of Economic Research, 2019. https://www.nber.org/papers/w25532

R pkg:

https://github.com/synth-inference/synthdid

Blog:

https://medium.com/@masa_asami/causal-inference-using-synthetic-difference-in-differences-with-python-5758e5a76909

Installation:

$ pip install git+https://github.com/MasaAsami/pysynthdid

This package is still under development. I plan to register with pypi after the following specifications are met.

  • Refactoring and better documentation
  • Completion of the TEST code

How to use:

Here's a simple example :

  • setup
from synthdid.model import SynthDID
from synthdid.sample_data import fetch_CaliforniaSmoking

df = fetch_CaliforniaSmoking()

PRE_TEREM = [1970, 1988]
POST_TEREM = [1989, 2000]

TREATMENT = ["California"]
  • estimation & plot
sdid = SynthDID(df, PRE_TEREM, POST_TEREM, TREATMENT)
sdid.fit(zeta_type="base")
sdid.plot(model="sdid")

  • Details of each method will be created later.

See the jupyter notebook for basic usage

  • ReproductionExperiment_CaliforniaSmoking.ipynb

    • This is a reproduction experiment note of the original paper, using a famous dataset (CaliforniaSmoking).

  • OtherOmegaEstimationMethods.ipynb

    • This note is a different take on the estimation method for parameter omega (& zeta ). As a result, it confirms the robustness of the estimation method in the original paper.

  • ScaleTesting_of_DonorPools.ipynb

    • In this note, we will check how the estimation results change with changes in the scale of the donor pool features.
    • Adding donor pools with extremely different scales (e.g., 10x) can have a significant impact (bias) on the estimates.
    • If different scales are mixed, as is usually the case in traditional regression, preprocessing such as logarithmic transformation is likely to be necessary

Discussions and PR:

  • This module is still under development.
  • If you have any questions or comments, please feel free to use issues.