A Method to Search for Differentially Expressed Genes and to Detect Recurrent Chromosomal Copy Number Aberrations R package fcros version 1.6-6 A fold change rank based method is presented to search for genes with changing expression and to detect recurrent chromosomal copy number aberrations. This method may be useful for high-throughput biological data (micro-array, sequencing, ...). Probabilities are associated with genes or probes in the data set and there is no problem of multiple tests when using this method. For array-based comparative genomic hybridization data, segmentation results are obtained by merging the significant probes detected. Software Depends: R (>= 4.0.0) Doulaye Dembele <doulaye@igbmc.fr> Comprehensive R Archive Network (CRAN) Doulaye Dembele [aut, cre] GPL (>= 2) 2026-01-27 application/tgz https://CRAN.R-project.org/package=fcros doi:10.32614/CRAN.package.fcros