Identification (biology)

Inference

Binary data

Mathematics

Biology

Politics

Statistics

Mathematical analysis

Political science

Estimator

Artificial intelligence

Management

Causal inference

Economics

Generalization

Representation (politics)

Computer science

Botany

Binary number

Arithmetic

Estimation

The Stata Journal Promoting communications on statistics and Stata

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 periods. 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 distinct 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 simplify applied works on program evaluation and causal inference when longitudinal data are available.

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