Estimation of pre- and posttreatment average treatment effects with binary time-varying treatment using Stata

Giovanni Cerulli and Marco Ventura

Stata Journal, 2019, vol. 19, issue 3, 551-565

Abstract: In this article, we describe tvdiff, a community-contributed command that implements a generalization of the difference-in-differences estimator to the case of binary time-varying treatment with pre- and postintervention peri- ods. tvdiff is flexible and can accommodate many actual situations, enabling the user to specify the number of pre- and postintervention periods and a graphical representation of the estimated coefficients. In addition, tvdiff provides two dis- tinct tests for the necessary condition of the identification of causal effects, namely, two tests for the so-called parallel-trend assumption. tvdiff is intended to sim- plify applied works on program evaluation and causal inference when longitudinal data are available.

Keywords: tvdiff; treatment effects; difference-in-differences (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1177/1536867X19874224

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