Seasonal Adjustment with 'X-13' in 'JDemetra+' 3.x R package rjd3x13 version 3.8.0 R Interface to 'JDemetra+' 3.x (<https://github.com/jdemetra>) time series analysis software. It offers full access to options and outputs of 'X-13', including Reg-ARIMA modelling (automatic AutoRegressive Integrated Moving Average (ARIMA) model with outlier detection and trading days adjustment) and X-11 decomposition. Software Depends: R (>= 4.1.0) Imports: rJava (>= 1.0-6), rjd3jars (>= 0.0.5), rjd3toolkit (>= 3.8.0), RProtoBuf (>= 0.4.25) Tanguy Barthelemy <timeserieswithjdemetraandr@gmail.com> Comprehensive R Archive Network (CRAN) Jean Palate [aut], Alain Quartier-la-Tente [aut] (ORCID: <https://orcid.org/0000-0001-7890-3857>), Tanguy Barthelemy [aut, cre, art], Anna Smyk [aut] EUPL 2026-07-10 application/tgz https://CRAN.R-project.org/package=rjd3x13 doi:10.32614/CRAN.package.rjd3x13