FLEXDID: Stata module for flexible estimation of difference-in-differences regression with staggered implementation

Partha Deb

Statistical Software Components from Boston College Department of Economics

Abstract: flexdid estimates average treatment effects on the treated (ATETs) in difference-in-differences designs with staggered implementation of treatment using a flexible linear model estimated by pooled OLS with covariates, (FLEX), as described in Deb et al. (2025). In the design, there must be at least one time-period in which all units are untreated, i.e., there cannot be any always-treated units. In addition, the typical design includes a set of never-treated units. FLEX can be specified using lags only parameters. In this case, the FLEX regression produces group by time effects that are identical to those producted by the estimator described in Borusyak et al. (2021). FLEX can also be specified using lags and leads parameters. In this case, when there are no covariates, the FLEX regression produces cohort by time effects that are identical to those produced by the regression adjustment estimator described in Callaway and Sant'Anna (2021).

Language: Stata
Requires: Stata version 17
Keywords: difference in differences; average treatment effect on the treated; staggered treatment (search for similar items in EconPapers)
Date: 2025-09-14, Revised 2025-10-20
Note: This module should be installed from within Stata by typing "ssc install flexdid". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/f/flexdid.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/f/flexdid_atet.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/f/flexdid_estat.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/f/flexdid.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/f/flexdid_postestimation.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/f/flexdid-examples.do sample do-file (text/plain)

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