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fereg: Fast Fixed-Effects Estimation with the 'fixest' Interface

Ordinary least squares, two-stage least squares, Poisson and logit regressions with any number of high-dimensional fixed effects, interactions of fixed effects, varying slopes, weights and iid, heteroskedasticity-robust (HC1, HC2, HC3), multiway-clustered, CRV3, Newey-West, Driscoll-Kraay or Conley standard errors. The formula syntax, arguments, results and methods follow the 'fixest' package and reproduce its estimates. The computations run in a parallel 'Rust' library that eliminates the largest fixed effect exactly and solves for the others by preconditioned conjugate gradient.

Version: 0.4.0
Depends: R (≥ 4.2)
Imports: stats
Suggests: fixest, testthat (≥ 3.0.0), data.table, generics, Matrix
Published: 2026-10-22
DOI: 10.32614/CRAN.package.fereg (may not be active yet)
Author: Leo Liu [aut, cre, cph], Authors of the bundled Rust crates [ctb, cph] (see inst/AUTHORS for each crate's authors and license)
fereg author details
Maintainer: Leo Liu <auleo.liu at gmail.com>
BugReports: https://github.com/leoliu0/fereg/issues
License: MIT + file LICENSE
URL: https://github.com/leoliu0/fereg
NeedsCompilation: yes
SystemRequirements: Cargo (Rust's package manager), rustc (>= 1.85)
Materials: README
CRAN checks: fereg results

Documentation:

Reference manual: fereg.html , fereg.pdf

Downloads:

Package source: fereg_0.4.0.tar.gz
Windows binaries: r-devel: not available, r-release: not available, r-oldrel: fereg_0.4.0.zip
macOS binaries: r-release (arm64): fereg_0.4.0.tgz, r-oldrel (arm64): fereg_0.4.0.tgz, r-release (x86_64): fereg_0.4.0.tgz, r-oldrel (x86_64): fereg_0.4.0.tgz

Linking:

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These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.