fect: Fixed Effects Counterfactual Estimators

Provides tools for estimating causal effects in panel data using counterfactual methods, as well as other modern DID estimators. It is designed for causal panel analysis with binary treatments under the parallel trends assumption. The package supports scenarios where treatments can switch on and off and allows for limited carryover effects. It includes several imputation estimators, such as Gsynth (Xu 2017), linear factor models, and the matrix completion method. Detailed methodology is described in Liu, Wang, and Xu (2024) <doi:10.48550/arXiv.2107.00856> and Chiu et al. (2025) <doi:10.48550/arXiv.2309.15983>. Optionally integrates with the "HonestDiDFEct" package for sensitivity analyses compatible with imputation estimators. "HonestDiDFEct" is not on CRAN but can be obtained from <https://github.com/lzy318/HonestDiDFEct>.

Version:	2.1.0
Depends:	R (≥ 4.1.0)
Imports:	Rcpp (≥ 0.12.3), ggplot2 (≥ 2.1.0), GGally (≥ 1.0.1), doParallel (≥ 1.0.10), doFuture, foreach (≥ 1.4.3), abind (≥ 1.4-0), MASS, gridExtra, grid, fixest, doRNG, future, parallelly, mvtnorm, dplyr, future.apply, reshape2, rlang, scales
LinkingTo:	Rcpp, RcppArmadillo
Suggests:	panelView, testthat (≥ 3.0.0), did, DIDmultiplegtDYN, ggrepel, HonestDiDFEct
Published:	2026-01-17
DOI:	10.32614/CRAN.package.fect
Author:	Licheng Liu [aut], Ziyi Liu [aut], Ye Wang [aut], Yiqing Xu [aut, cre], Tianzhu Qin [aut], Shiyun Hu [aut], Rivka Lipkovitz [aut]
Maintainer:	Yiqing Xu <yiqingxu at stanford.edu>
BugReports:	https://github.com/xuyiqing/fect/issues
License:	MIT + file LICENSE
URL:	https://yiqingxu.org/packages/fect/, https://github.com/xuyiqing/fect
NeedsCompilation:	yes
CRAN checks:	fect results

Documentation:

Reference manual:

fect.html , fect.pdf

Downloads:

Package source:	fect_2.1.0.tar.gz
Windows binaries:	r-devel: fect_2.1.0.zip, r-release: fect_2.1.0.zip, r-oldrel: fect_2.1.0.zip
macOS binaries:	r-release (arm64): fect_2.1.0.tgz, r-oldrel (arm64): fect_2.1.0.tgz, r-release (x86_64): fect_2.1.0.tgz, r-oldrel (x86_64): fect_2.1.0.tgz
Old sources:	fect archive

Reverse dependencies:

Reverse imports:

gsynth

Linking:

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