Panel Fixed Effects Filtered and Variance Decomposition Estimation R package xtfifevd version 1.0.2 Implements fixed effects estimators for time-invariant variables in panel data models. Provides three estimation methods: FEVD (Fixed Effects Vector Decomposition) from Plumper and Troeger (2007) <doi:10.1093/pan/mpm002>, and FEF (Fixed Effects Filtered) and FEF-IV (instrumental variables variant) from Pesaran and Zhou (2018) <doi:10.1080/07474938.2016.1222225>. All methods use the correct Pesaran-Zhou variance estimators that account for generated regressor uncertainty, avoiding the size distortions documented in the literature. Software Depends: R (>= 4.1.0) Imports: stats, MASS Suggests: plm, lmtest, sandwich, testthat (>= 3.0.0), knitr, rmarkdown Muhammad Alkhalaf <muhammedalkhalaf@gmail.com> Comprehensive R Archive Network (CRAN) Muhammad Alkhalaf [aut, cre, cph] (ORCID: <https://orcid.org/0009-0002-2677-9246>) GPL-3 2026-04-28 application/tgz https://CRAN.R-project.org/package=xtfifevd doi:10.32614/CRAN.package.xtfifevd