ABdesign                Sample size determination for A + B escalation
                        design without dose de-escalation
crsize                  Sample size determination for crossover study
                        design
crt.match               Cluster numbers determination for cluster
                        randomized trails (CRT) matched case
crt.unmatch             Cluster number determination for cluster
                        randomized trails (CRT) unmatched case
expsize                 Sample size determination for survival data
                        using exponential assumption
phsize                  Sample size determination using proportional
                        hazard assumption
precsize                Sample size determination using power and
                        precision analysis
prsize                  Sample size determination for parallel study
                        design.
