Package: did 2.5.0

did: Treatment Effects with Multiple Periods and Groups

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.

Authors:Brantly Callaway [aut, cre], Pedro H. C. Sant'Anna [aut]

did_2.5.0.tar.gz
did_2.5.0.zip(r-4.7)did_2.5.0.zip(r-4.6)did_2.5.0.zip(r-4.5)
did_2.5.0.tgz(r-4.6-any)did_2.5.0.tgz(r-4.5-any)
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did_2.5.0.tgz(r-4.6-emscripten)
manual.pdf |manual.html✨
card.svg |card.png
did/json (API)
NEWS

# Install 'did' in R:
install.packages('did', repos = c('https://bcallaway11.r-universe.dev', 'https://cloud.r-project.org'))

Bug tracker:https://github.com/bcallaway11/did/issues

Pkgdown/docs site:https://bcallaway11.github.io

Datasets:
  • mpdta - County Teen Employment Dataset

On CRAN:

Conda:

13.51 score 403 stars 4 packages 1.9k scripts 14k downloads 25 exports 47 dependencies

Last updated from:c449b8ce72. Checks:9 OK. Indexed: yes.

TargetResultTimeFilesSyslog
linux-devel-x86_64OK512
source / vignettesOK240
linux-release-x86_64OK503
macos-release-arm64OK370
macos-oldrel-arm64OK377
windows-develOK585
windows-releaseOK537
windows-oldrelOK554
wasm-releaseOK169

Exports:aggteAGGTEobjatt_gtbuild_sim_datasetcompute.aggtecompute.att_gtcompute.att_gt2conditional_did_pretestDIDparamsggdidglancegplotindicatormbootMPMP.TESTpre_process_didpre_process_did2process_attgtreset.simsimsplottest.mboottidytrimmer

Dependencies:BHbigmemorybigmemory.sriBMiscclicpp11data.tabledplyrDRDIDdreamerrfarverfastglmFormulagenericsggplot2gluegtableisobandlabelinglatticelifecyclemagrittrMatrixpbapplypillarpkgconfigpurrrR6RColorBrewerRcppRcppArmadilloRcppEigenrlangS7scalesstringistringmagicstringrtibbletidyrtidyselecttrustutf8uuidvctrsviridisLitewithr

Getting Started with the did Package

Brantly Callaway and Pedro H.C. Sant'Anna

Rendered fromdid-basics.Rmdusingknitr::rmarkdownon Jun 13 2026.

Last update: 2026-06-13
Started: 2019-03-27

Introduction to DiD with Multiple Time Periods

Brantly Callaway and Pedro H.C. Sant'Anna

Rendered frommulti-period-did.Rmdusingknitr::rmarkdownon Jun 13 2026.

Last update: 2026-06-10
Started: 2020-03-31

Pre-Testing in a DiD Setup using the did Package

Brantly Callaway and Pedro H.C. Sant'Anna

Rendered frompre-testing.Rmdusingknitr::rmarkdownon Jun 13 2026.

Last update: 2026-03-02
Started: 2020-03-31

Problems with two-way fixed-effects event-study regressions

Brantly Callaway and Pedro H. C. Sant'Anna

Rendered fromTWFE.Rmdusingknitr::rmarkdownon Jun 13 2026.

Last update: 2026-06-10
Started: 2021-01-14

Writing Extensions to the did Package

Brantly Callaway and Pedro H.C. Sant'Anna

Rendered fromextensions.Rmdusingknitr::rmarkdownon Jun 13 2026.

Last update: 2020-12-08
Started: 2020-07-21