Transfer Function and ARIMA Models R package tfarima version 0.4.1 CRAN Task View: TimeSeries (https://CRAN.R-project.org/view=TimeSeries) Build customized transfer function and ARIMA models with multiple operators and parameter restrictions. Provides tools for model identification, estimation using exact or conditional maximum likelihood, diagnostic checking, automatic outlier detection, calendar effects, forecasting, and seasonal adjustment. The new version also supports unobserved component ARIMA model specification and estimation for structural time series analysis. Software Depends: R (>= 3.5.0) Imports: Rcpp (>= 1.0.0), stats, MASS, numDeriv, zoo, nnls, quadprog LinkingTo: Rcpp, RcppArmadillo Suggests: knitr, rmarkdown Jose L. Gallego <jose.gallego@unican.es> Comprehensive R Archive Network (CRAN) Jose L. Gallego [aut, cre] GPL (>= 2) 2025-11-03 application/tgz https://CRAN.R-project.org/package=tfarima doi:10.32614/CRAN.package.tfarima