참고 - [Causal Inference for the Brave and True - Matching](https://matheusfacure.github.io/python-causality-handbook/10-Matching.html), [Propensity Score](https://matheusfacure.github.io/python-causality-handbook/11-Propensity-Score.html) - [DoWhy - DistanceMatchingEstimator](https://www.pywhy.org/dowhy/v0.13/_modules/dowhy/causal_estimators/distance_matching_estimator.html#DistanceMatchingEstimator)
