| design_cont | Design the clinical trial for continuous outcome | 
| design_ord | Design the clinical trial for ordinal outcome | 
| design_surv | Design the clinical trial for survival outcome | 
| op_fwer_cont | Provides operating characteristics of group sequential MAMS trial for continuous outcome under null hypothesis | 
| op_fwer_ord | Provides operating characteristics of group sequential MAMS trial for ordinal outcome under null hypothesis | 
| op_fwer_surv | Provides operating characteristics of group sequential MAMS trial for survival outcome under null hypothesis | 
| op_power_cont | Provides operating characteristics of group sequential MAMS trial for continuous outcome | 
| op_power_ord | Provides operating characteristics of group sequential MAMS trial for ordinal outcome | 
| op_power_surv | Provides operating characteristics of group sequential MAMS trial for survival outcome |