Time Feature Extrapolation Using Spectral Analysis and Jack-Knife Resampling R package spooky version 1.4.0 Proposes application of spectral analysis and jack-knife resampling for multivariate sequence forecasting. The application allows for a fast random search in a compact space of hyper-parameters composed by Sequence Length and Jack-Knife Leave-N-Out. Software Depends: R (>= 3.6) Imports: purrr (>= 0.3.4), ggplot2 (>= 3.3.5), readr (>= 2.1.2), lubridate (>= 1.7.10), imputeTS (>= 3.2), fANCOVA (>= 0.6-1), scales (>= 1.1.1), tictoc (>= 1.0.1), modeest (>= 2.4.0), moments (>= 0.14), greybox (>= 1.0.1), philentropy (>= 0.5.0), entropy (>= 1.3.1), fastDummies (>= 1.6.3) Giancarlo Vercellino <giancarlo.vercellino@gmail.com> Comprehensive R Archive Network (CRAN) Giancarlo Vercellino GPL-3 2022-08-13 application/tgz https://CRAN.R-project.org/package=spooky doi:10.32614/CRAN.package.spooky