Panel Unit Root Test Based on Recursive Detrending R package xtrec version 1.0.0 Implements the recursively detrended panel unit root tests proposed by Westerlund (2015) <doi:10.1016/j.jeconom.2014.09.013>. Two variants are provided: the basic t-REC test assuming iid errors, and the robust t-RREC test that accounts for serial correlation, cross-sectional dependence, and heteroskedasticity via defactoring and BIC-selected lag augmentation. Both tests have a standard normal null distribution requiring no mean or variance correction. The panel must be strongly balanced. Software Depends: R (>= 3.5.0) Imports: stats Suggests: testthat (>= 3.0.0) 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 2026-03-29 application/tgz https://CRAN.R-project.org/package=xtrec doi:10.32614/CRAN.package.xtrec