get_oc                  Generate operating characteristics for
                        Two-Stage Screened Selection Design for
                        Randomized Phase II Trials with Time-to-Event
                        Endpoints
get_oc_3arm             Generate operating characteristics for
                        Two-Stage Screened Selection Design for
                        Randomized Phase II Trials with Time-to-Event
                        Endpoints for 3 arms
optimal                 Find optimal parameters
sample_size             Calculate the sample size for each arm
sample_size_3arm        Calculate the sample size for each arm
sampsize_1stage_2arm    Calculate the sample size for each arm
