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fereg (Python)

Fast high-dimensional fixed-effects regressions with pyfixest-compatible syntax and results.

fereg.feols, fereg.fepois and fereg.feglm take pyfixest 0.60.0's formulas, arguments and defaults and return results with pyfixest's classes, names and methods, so estimates, standard errors and statistics match pyfixest's. The estimation runs in a parallel Rust core that eliminates the largest fixed effect exactly and solves the others by preconditioned conjugate gradient: at 10 million observations and 16 threads it is 5–100× faster than pyfixest and 2–200× faster than R's fixest on the fixest benchmark designs.

import fereg

m = fereg.feols("y ~ x1 + x2 | firm + year", data=df, vcov={"CRV1": "firm"})
iv = fereg.feols("y ~ x1 | firm + year | x2 ~ z", data=df)
p = fereg.fepois("count ~ x1 | firm + year", data=df, vcov="hetero")
lg = fereg.feglm("default ~ x1 | firm", data=df, family="logit")
m.summary()
fereg.etable([m, iv, p], type="md")
m.fixef()

Supported: OLS, IV/2SLS (several endogenous regressors), Poisson, logit; any number of fixed effects, fe1^fe2 interactions and varying slopes fe[x]; weights; i(), C(), multiple estimation (sw, csw, several left-hand sides, split/fsplit); predict, resid, fixef, tidy, etable. Data can be pandas or polars.

Variances (vcov= at estimation, or post hoc with m.vcov(...)), as in pyfixest with ssc(): "iid", "hetero"/"HC1", "HC2", "HC3"; {"CRV1": "a+b"} and {"CRV3": "a+b"} (up to four-way); Newey–West "NW" and Driscoll–Kraay "DK" with vcov_kwargs={"time_id": "year", "panel_id": "firm", "lag": 2}. fereg extensions (pyfixest raises): HC2/HC3 with fixed effects, CRV3 for IV and logit (logit refits), Newey–West / Driscoll–Kraay for IV and Driscoll–Kraay without panel_id, and fixest's Conley spatial HAC: vcov="conley", vcov_kwargs={"lat": "lat", "lon": "lon", "cutoff": "100km"} (cutoff in km or "60mi", default deduced as fixest; pixel, distance="triangular"|"spherical").

Not implemented: probit; nid variances (raise NotImplementedError); wild bootstrap, ccv, decompose, ritest, plotting and DiD helpers.

nthreads (default: all cores) sets the number of threads. Results do not depend on it.

The same core powers the Stata commands fereg/feppml/felogit and the R package fereg: see https://github.com/leoliu0/fereg.

Metadata

Release files for fereg 0.4.0

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Source distribution (sdist)

Source distribution for fereg 0.4.0
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fereg-0.4.0-cp314-cp314-win_amd64.whl CPython 3.14 CPython 3.14 Windows x86-64 Details for fereg-0.4.0-cp314-cp314-win_amd64.whl
fereg-0.4.0-cp314-cp314-manylinux_2_28_x86_64.whl CPython 3.14 CPython 3.14 Linux glibc 2.28+ x86-64 Details for fereg-0.4.0-cp314-cp314-manylinux_2_28_x86_64.whl
fereg-0.4.0-cp314-cp314-manylinux_2_28_aarch64.whl CPython 3.14 CPython 3.14 Linux glibc 2.28+ ARM64 Details for fereg-0.4.0-cp314-cp314-manylinux_2_28_aarch64.whl
fereg-0.4.0-cp314-cp314-macosx_11_0_arm64.whl CPython 3.14 CPython 3.14 macOS 11.0+ ARM64 Details for fereg-0.4.0-cp314-cp314-macosx_11_0_arm64.whl
fereg-0.4.0-cp314-cp314-macosx_10_12_x86_64.whl CPython 3.14 CPython 3.14 macOS 10.12+ x86-64 Details for fereg-0.4.0-cp314-cp314-macosx_10_12_x86_64.whl
fereg-0.4.0-cp313-cp313-win_amd64.whl CPython 3.13 CPython 3.13 Windows x86-64 Details for fereg-0.4.0-cp313-cp313-win_amd64.whl
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fereg-0.4.0-cp313-cp313-manylinux_2_28_aarch64.whl CPython 3.13 CPython 3.13 Linux glibc 2.28+ ARM64 Details for fereg-0.4.0-cp313-cp313-manylinux_2_28_aarch64.whl
fereg-0.4.0-cp313-cp313-macosx_11_0_arm64.whl CPython 3.13 CPython 3.13 macOS 11.0+ ARM64 Details for fereg-0.4.0-cp313-cp313-macosx_11_0_arm64.whl
fereg-0.4.0-cp313-cp313-macosx_10_12_x86_64.whl CPython 3.13 CPython 3.13 macOS 10.12+ x86-64 Details for fereg-0.4.0-cp313-cp313-macosx_10_12_x86_64.whl
fereg-0.4.0-cp312-cp312-win_amd64.whl CPython 3.12 CPython 3.12 Windows x86-64 Details for fereg-0.4.0-cp312-cp312-win_amd64.whl
fereg-0.4.0-cp312-cp312-manylinux_2_28_x86_64.whl CPython 3.12 CPython 3.12 Linux glibc 2.28+ x86-64 Details for fereg-0.4.0-cp312-cp312-manylinux_2_28_x86_64.whl
fereg-0.4.0-cp312-cp312-manylinux_2_28_aarch64.whl CPython 3.12 CPython 3.12 Linux glibc 2.28+ ARM64 Details for fereg-0.4.0-cp312-cp312-manylinux_2_28_aarch64.whl
fereg-0.4.0-cp312-cp312-macosx_11_0_arm64.whl CPython 3.12 CPython 3.12 macOS 11.0+ ARM64 Details for fereg-0.4.0-cp312-cp312-macosx_11_0_arm64.whl
fereg-0.4.0-cp312-cp312-macosx_10_12_x86_64.whl CPython 3.12 CPython 3.12 macOS 10.12+ x86-64 Details for fereg-0.4.0-cp312-cp312-macosx_10_12_x86_64.whl
fereg-0.4.0-cp311-cp311-win_amd64.whl CPython 3.11 CPython 3.11 Windows x86-64 Details for fereg-0.4.0-cp311-cp311-win_amd64.whl
fereg-0.4.0-cp311-cp311-manylinux_2_28_x86_64.whl CPython 3.11 CPython 3.11 Linux glibc 2.28+ x86-64 Details for fereg-0.4.0-cp311-cp311-manylinux_2_28_x86_64.whl
fereg-0.4.0-cp311-cp311-manylinux_2_28_aarch64.whl CPython 3.11 CPython 3.11 Linux glibc 2.28+ ARM64 Details for fereg-0.4.0-cp311-cp311-manylinux_2_28_aarch64.whl
fereg-0.4.0-cp311-cp311-macosx_11_0_arm64.whl CPython 3.11 CPython 3.11 macOS 11.0+ ARM64 Details for fereg-0.4.0-cp311-cp311-macosx_11_0_arm64.whl
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fereg-0.4.0-cp310-cp310-manylinux_2_28_x86_64.whl CPython 3.10 CPython 3.10 Linux glibc 2.28+ x86-64 Details for fereg-0.4.0-cp310-cp310-manylinux_2_28_x86_64.whl
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