Bayes Factor Design for Two-Arm Binomial Trials // 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.