Fourier CUSUM Cointegration Test R package FCUSUM version 1.0.0 Implements the Fourier cumulative sum (CUSUM) cointegration test for detecting cointegration relationships in time series data with structural breaks. The test uses Fourier approximations to capture smooth structural changes and CUSUM statistics to test for cointegration stability. Based on methodology described in Zaghdoudi (2025) <doi:10.46557/001c.144076>. The corrected Akaike Information Criterion (AICc) is used for optimal frequency selection. Software Depends: R (>= 3.5.0) Imports: stats Taha Zaghdoudi <zedtaha@gmail.com> Comprehensive R Archive Network (CRAN) Taha Zaghdoudi [aut, cre] GPL-3 2025-11-12 application/tgz https://CRAN.R-project.org/package=FCUSUM doi:10.32614/CRAN.package.FCUSUM