Extended Changes-in-Changes R package ecic version 0.0.4 Extends the Changes-in-Changes model a la Athey and Imbens (2006) <doi:10.1111/j.1468-0262.2006.00668.x> to multiple cohorts and time periods, which generalizes difference-in-differences estimation techniques to the entire distribution. Computes quantile treatment effects for every possible two-by-two combination in ecic(). Then, aggregating all bootstrap runs adds the standard errors in summary_ecic(). Results can be plotted with plot_ecic() aggregated over all cohort-group combinations or in an event-study style for either individual periods or individual quantiles. Software Depends: R (>= 2.10) Imports: furrr, future, ggplot2, patchwork, progress, progressr, stats Suggests: tinytest Frederic Kluser <frederic.kluser@unibe.ch> Comprehensive R Archive Network (CRAN) Frederic Kluser [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-4454-7572>) MIT + file LICENSE (https://CRAN.R-project.org/package=ecic/LICENSE) 2025-01-20 application/tgz https://CRAN.R-project.org/package=ecic doi:10.32614/CRAN.package.ecic