Estimate and Forecast Real-Time Infection Dynamics R package EpiNow2 version 1.8.0 CRAN Task View: Epidemiology (https://CRAN.R-project.org/view=Epidemiology) Estimates the time-varying reproduction number, rate of spread, and doubling time using a renewal equation approach combined with Bayesian inference via Stan. Supports Gaussian process and random walk priors for modelling changes in transmission over time. Accounts for delays between infection and observation (incubation period, reporting delays), right-truncation in recent data, day-of-week effects, and observation overdispersion. Can estimate relationships between primary and secondary outcomes (e.g., cases to hospitalisations or deaths) and forecast both. Runs across multiple regions in parallel. Based on Abbott et al. (2020) <doi:10.12688/wellcomeopenres.16006.1> and Gostic et al. (2020) <doi:10.1101/2020.06.18.20134858>. Software Depends: R (>= 3.5.0) Imports: checkmate, cli, data.table (>= 1.15.0), futile.logger (>= 1.4), ggplot2, lifecycle, lubridate, methods, patchwork, posterior, primarycensored, purrr, R.utils (>= 2.0.0), Rcpp (>= 0.12.0), rlang (>= 0.4.7), rstan (>= 2.26.0), rstantools (>= 2.2.0), runner, scales, stats, truncnorm, utils LinkingTo: BH (>= 1.66.0), Rcpp (>= 0.12.0), RcppEigen (>= 0.3.3.3.0), RcppParallel (>= 5.0.1), rstan (>= 2.26.0), StanHeaders (>= 2.26.0) Suggests: cmdstanr, future, future.apply, knitr, parallelly, progressr, rmarkdown, scoringutils, spelling, testthat, withr Sebastian Funk <sebastian.funk@lshtm.ac.uk> Comprehensive R Archive Network (CRAN) Sam Abbott [aut] (ORCID: <https://orcid.org/0000-0001-8057-8037>), Joel Hellewell [aut] (ORCID: <https://orcid.org/0000-0003-2683-0849>), Katharine Sherratt [aut], Katelyn Gostic [aut], Joe Hickson [aut], Hamada S. Badr [aut] (ORCID: <https://orcid.org/0000-0002-9808-2344>), Michael DeWitt [aut] (ORCID: <https://orcid.org/0000-0001-8940-1967>), James M. Azam [aut] (ORCID: <https://orcid.org/0000-0001-5782-7330>), Adrian Lison [aut] (ORCID: <https://orcid.org/0000-0002-6822-8437>), Robin Thompson [ctb], Sophie Meakin [ctb], James Munday [ctb], Nikos Bosse [ctb], Paul Mee [ctb], Peter Ellis [ctb], Pietro Monticone [ctb], Lloyd Chapman [ctb], Andrew Johnson [ctb], Kaitlyn Johnson [ctb] (ORCID: <https://orcid.org/0000-0001-8011-0012>), Adam Howes [ctb] (ORCID: <https://orcid.org/0000-0003-2386-4031>), Sebastian Funk [aut, cre] (ORCID: <https://orcid.org/0000-0002-2842-3406>) MIT + file LICENSE (https://CRAN.R-project.org/package=EpiNow2/LICENSE) 2026-02-04 application/tgz https://CRAN.R-project.org/package=EpiNow2 doi:10.32614/CRAN.package.EpiNow2 en-GB