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DIDmultiplegt
Estimators DID with Multiple Groups and Periods
View on CRAN: Click
here
Download and install DIDmultiplegt package within the R console
Install from CRAN:
install.packages("DIDmultiplegt")
Install from Github:
library("remotes")
install_github("cran/DIDmultiplegt") Install by package version:
library("remotes")
install_version("DIDmultiplegt", "2.0.0") Attach the package and use:
library("DIDmultiplegt")
Maintained by
Diego Ciccia
[Scholar Profile | Author Map]
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2020-10-26
Latest Update: 2024-07-16
Description:
Estimate the effect of a treatment on an outcome in sharp Difference-in-Difference designs with multiple groups and periods.
It computes the DIDM estimator introduced in Section 4 of "Two-Way Fixed Effects Estimators with Heterogeneous
Treatment Effects" (Chaisemartin, D'Haultfoeuille (2020) ), which
generalizes the standard DID estimator with two groups, two periods and a binary treatment to situations
with many groups,many periods and a potentially non-binary treatment. For each pair of consecutive time
periods t-1 and t and for each value of the treatment d, the package computes a DID estimator comparing
the outcome evolution among the switchers, the groups whose treatment changes from d to some other value
between t-1 and t, to the same evolution among control groups whose treatment is equal to d both in t-1 and t.
Then the DIDM estimator is equal to the average of those DIDs across all pairs of consecutive time periods and
across all values of the treatment. Under a parallel trends assumption, DIDM is an unbiased and consistent estimator
of the average treatment effect among switchers, at the time period when they switch.
The package can also compute placebo estimators that can be used to test the parallel trends assumption.
Finally, in staggered adoption designs where each group's treatment is weakly increasing over time,
it can compute estimators of switchers' dynamic treatment effects, one time period or more after they have
started receiving the treatment.
How to cite:
Diego Ciccia (2020). DIDmultiplegt: Estimators DID with Multiple Groups and Periods. R package version 2.0.0, https://cran.r-project.org/web/packages/DIDmultiplegt. Accessed 05 Aug. 2026.
Previous versions and publish date:
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Complete documentation for DIDmultiplegt
Functions, R codes and Examples using
the DIDmultiplegt R package
Some associated functions: did_multiplegt .
Some associated R codes: did_multiplegt.R . Full DIDmultiplegt package functions and examples
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