Implements a set of methodological tools that enable researchers to apply matching methods to time-series cross-sectional data. Imai, Kim, and Wang (2018) proposes a nonparametric generalization of the difference-in-differences estimator, which does not rely on the linearity assumption as often done in practice. Researchers first select a method of matching each treated observation for a given unit in a particular time period with control observations from other units in the same time period that have a similar treatment and covariate history. These methods include standard matching methods based on propensity score and Mahalanobis distance, as well as weighting methods. Once matching is done, both short-term and long-term average treatment effects for the treated can be estimated with standard errors. The package also offers a visualization technique that allows researchers to assess the quality of matches by examining the resulting covariate balance.
|License:||GPL (>= 3)|
In Song Kim <email@example.com>, Erik Wang <haixiao@Princeton.edu>, Adam Rauh <firstname.lastname@example.org>, and Kosuke Imai <email@example.com>
Maintainer: In Song Kim firstname.lastname@example.org
Imai, Kosuke, In Song Kim and Erik Wang. (2018)
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