Package: did
Title: Treatment Effects with Multiple Periods and Groups
Version: 2.5.1.902
Authors@R: c(person("Brantly", "Callaway", email = "brantly.callaway@uga.edu", role = c("aut", "cre")), person("Pedro H. C.", "Sant'Anna", email="pedro.santanna@emory.edu", role = c("aut")))
URL: https://bcallaway11.github.io/did/,
        https://github.com/bcallaway11/did/
Description: The standard Difference-in-Differences (DID) setup
        involves two periods and two groups -- a treated group and
        untreated group.  Many applications of DID methods involve more
        than two periods and have individuals that are treated at
        different points in time.  This package contains tools for
        computing average treatment effect parameters in Difference in
        Differences setups with more than two periods and with
        variation in treatment timing using the methods developed in
        Callaway and Sant'Anna (2021)
        <doi:10.1016/j.jeconom.2020.12.001>.  The main parameters are
        group-time average treatment effects which are the average
        treatment effect for a particular group at a particular time.
        These can be aggregated into a fewer number of treatment effect
        parameters, and the package deals with the cases where there is
        selective treatment timing, dynamic treatment effects, calendar
        time effects, or combinations of these.  There are also
        functions for testing the Difference in Differences assumption,
        and plotting group-time average treatment effects.
Depends: R (>= 4.1.0)
License: GPL-3
Encoding: UTF-8
LazyData: true
Imports: BMisc (>= 1.4.4), Matrix, pbapply, ggplot2, DRDID (>= 1.3.0),
        generics, methods, tidyr, fastglm, data.table (>= 1.15.4),
        dreamerr (>= 1.4.0)
Roxygen: list(markdown = TRUE)
VignetteBuilder: knitr
Suggests: rmarkdown, plm, here, knitr, covr, backports, broom, testthat
        (>= 3.0.0), withr, remotes, callr
Config/roxygen2/version: 8.0.0
Config/pak/sysreqs: libicu-dev
Repository: https://bcallaway11.r-universe.dev
Date/Publication: 2026-08-28 22:35:39 UTC
RemoteUrl: https://github.com/bcallaway11/did
RemoteRef: HEAD
RemoteSha: 74b88eb07f1faa644df1271055a0f77848f6550c
NeedsCompilation: no
Packaged: 2026-09-28 07:26:57 UTC; root
Author: Brantly Callaway [aut, cre],
  Pedro H. C. Sant'Anna [aut]
Maintainer: Brantly Callaway <brantly.callaway@uga.edu>
