Interactive Fixed Effects Estimator for Balanced Panel Data R package xtife version 0.1.3 Implements the interactive fixed effects ('IFE') panel estimator of Bai (2009) <doi:10.3982/ECTA6135> with analytical standard errors ('homoskedastic', 'HC1' robust, and cluster-robust by unit). Supports asymptotic bias correction for large panels (Bai 2009) and a dynamic extension for predetermined regressors (Moon and Weidner 2017 <doi:10.1017/S0266466615000328>). Includes information-criterion-based factor number selection (Bai and Ng 2002 <doi:10.1111/1468-0262.00273>). All computations use base R only with no external dependencies. Software Depends: R (>= 3.5.0) Imports: stats Suggests: testthat (>= 3.0.0), knitr, rmarkdown Binzhi Chen <Binzhi.Chen9@gmail.com> Comprehensive R Archive Network (CRAN) Binzhi Chen [aut, cre] GPL-2 GPL-3 2026-04-21 application/tgz https://CRAN.R-project.org/package=xtife doi:10.32614/CRAN.package.xtife en-US