Bayes Factor Design for Two-Arm Binomial Trials R package bfbin2arm version 0.1.5 Design and analysis of one- and two-stage binomial clinical phase II trials using Bayes factors. Implements Bayes factors for point-null and directional hypotheses, predictive densities under different hypotheses, and power and sample size calibration. Both one-arm trials with only a single treatment arm and two-arm trials with treatment and control arm are implemented for the one- and two-stage designs. Software Depends: R (>= 4.0.0) Imports: stats, VGAM, dplyr, parallel, utils, ggplot2, patchwork, rlang Suggests: knitr, rmarkdown, kableExtra, testthat (>= 3.0.0), purrr, tidyr, Riko Kelter <rkelter@uni-koeln.de> Comprehensive R Archive Network (CRAN) Riko Kelter [aut, cre] GPL-3 2026-07-06 application/tgz https://CRAN.R-project.org/package=bfbin2arm doi:10.32614/CRAN.package.bfbin2arm