A Collection of Efficient and Extremely Fast R Functions R package Rfast version 2.1.5.2 A collection of fast (utility) functions for data analysis. Column and row wise means, medians, variances, minimums, maximums, many t, F and G-square tests, many regressions (normal, logistic, Poisson), are some of the many fast functions. References: a) Tsagris M., Papadakis M. (2018). Taking R to its limits: 70+ tips. PeerJ Preprints 6:e26605v1 <doi:10.7287/peerj.preprints.26605v1>. b) Tsagris M. and Papadakis M. (2018). Forward regression in R: from the extreme slow to the extreme fast. Journal of Data Science, 16(4): 771--780. <doi:10.6339/JDS.201810_16(4).00006>. c) Chatzipantsiou C., Dimitriadis M., Papadakis M. and Tsagris M. (2020). Extremely Efficient Permutation and Bootstrap Hypothesis Tests Using Hypothesis Tests Using R. Journal of Modern Applied Statistical Methods, 18(2), eP2898. <doi:10.48550/arXiv.1806.10947>. d) Tsagris M., Papadakis M., Alenazi A. and Alzeley O. (2024). Computationally Efficient Outlier Detection for High-Dimensional Data Using the MDP Algorithm. Computation, 12(9): 185. <doi:10.3390/computation12090185>. e) Tsagris M. and Papadakis M. (2025). Fast and light-weight energy statistics using the R package Rfast. <doi:10.48550/arXiv.2501.02849>. Software Depends: R (>= 3.5.0), Rcpp (>= 0.12.3), zigg, RcppParallel LinkingTo: Rcpp (>= 0.12.3), RcppArmadillo, RcppParallel, zigg Suggests: philentropy Manos Papadakis <rfastofficial@gmail.com> Comprehensive R Archive Network (CRAN) Manos Papadakis [aut, cre, cph], Michail Tsagris [aut], Marios Dimitriadis [aut], Stefanos Fafalios [aut], Matteo Fasiolo [aut], Morgan Jacob [ctb], Giorgos Borboudakis [aut], John Burkardt [aut], Changliang Zou [aut] GPL (>= 2.0) 2025-10-10 application/tgz https://CRAN.R-project.org/package=Rfast doi:10.32614/CRAN.package.Rfast