alpNeeded               Function to compute alpha needed (fixed sample
                        size)
alpNeeded2              Function to compute alpha needed (fixed sample
                        size)
assurance               Assurance (expected power) for LWYY
assurance2              Assurance (expected power) for LWYY
btaNeeded               Function to compute log rate ratio needed
                        (fixed sample size)
btaNeeded2              Function to compute log rate ratio needed
                        (fixed sample size)
btaNeeded3              Function to compute log rate ratio needed
erNeeded                Baseline event rate needed (fixed sample size)
eventsNeeded            Number of events needed
eventsNeeded2           Number events needed (fixed sample size)
nNeeded                 Function to compute sample size needed to
                        achieve target power
nNeeded2                Function to compute sample size needed to
                        achieve target power
pow                     Power for LWYY (fixed sample size)
pow2                    Power for LWYY (fixed sample size)
power.lwyy.test         Power calculations for one-sided two-sample
                        test of LWYY model parameter.
thtap2thta              Obtain theta from pooled theta (model without
                        treatment).
