https://cgeraldes.r-universe.devRecent package updates in cgeraldesR-universehttps://github.com/cgeraldes.pnghttps://cgeraldes.r-universe.devSun, 15 Mar 2026 20:01:27 GMTcgeraldes@gmail.com (Carlos Bras-Geraldes)Implements the Butterworth-Induced Autoregressive ('BTWAR') model, where autoregressive coefficients are obtained from analog Butterworth filter prototypes mapped into the discrete-time domain using the Matched Z-Transform. The framework establishes a structured connection between frequency-domain filter design and time-domain autoregressive modeling. Model order selection is performed via nested rolling-origin cross-validation. Method described in Bras-Geraldes, Rocha and Martins (2026) <doi:10.3390/math14030479>.https://github.com/r-universe/cgeraldes/actions/runs/26155367067Sun, 15 Mar 2026 20:01:27 GMTBTWAR1.0.1successhttps://cgeraldes.r-universe.devhttps://github.com/cgeraldes/btwarBTWAR.RmdBTWAR.htmlIntroduction to the BTWAR Package2026-03-01 13:56:312026-03-15 04:08:59