Apply.calendar.censoring
                        Function to apply a given calendar time as
                        effective censoring time.
Apply.calendar.censoring.2
                        Function to apply a given calendar time as
                        effective censoring time for two-sample
                        composite endpoint data.
OBF                     O'Brien-Flemming error spending function.
OneSample.Estimator.sequential
                        Function to estimate the one-sample mean
                        frequency under a group sequential design.
Onesample.generate.sequential
                        Function to simulate one-sample composite
                        endpoint data under staggered entry.
Solve.beta.given.power
                        Function to solve for the treatment effect
                        parameter to achieve target power by Monte
                        Carlo simulation.
True.mu                 Function to calculate the true value of the
                        mean frequency function.
TwoSample.Boundary.TTFE
                        Function to calculate the sequential rejection
                        boundaries for the time-to-first-event (TTFE)
                        method.
TwoSample.Constant.GT   Function to compute calibration constants for
                        the two-sample generalized-t statistics.
TwoSample.Constant.LR   Function to compute calibration constants for
                        the two-sample generalized log-rank statistics.
TwoSample.Estimator.GT.sequential
                        Function to calculate the two-sample
                        generalized-t statistic for composite endpoint
                        under sequential monitoring.
TwoSample.Estimator.LR.sequential
                        Function to calculate the two-sample
                        generalized log-rank statistic for composite
                        endpoint under sequential monitoring.
TwoSample.Estimator.TTFE.sequential
                        Function to calculate the Z statistics and
                        variance for the time-to-first-event (TTFE)
                        method.
TwoSample.Q.Cov.Estimator.Sequential.GT
                        Function to calculate stage-wise test
                        statistics, variances, and correlation for
                        two-sample generalized-t statistics.
TwoSample.Q.Cov.Estimator.Sequential.LR
                        Function to calculate stage-wise test
                        statistics, variances, and correlation for
                        two-sample generalized log-rank statistics.
TwoSample.Wald.and.Boundary
                        Function to calculate the Wald statistics and
                        group sequential boundaries for two-sample
                        monitoring.
TwoSample.Z.Var.Estimator.Sequential.TTFE
                        Function to calculate the two-sample
                        time-to-first-event (TTFE) statistics and
                        variances across multiple calendar times.
TwoSample.generate.sequential
                        Function to simulate two-sample composite
                        endpoint data under staggered entry.
find.Delta.given.power
                        Function to solve for the mean frequency effect
                        size given target power for one-sample
                        simulations.
find.beta.trt           Function to solve for treatment effect size
                        given target power for two-sample tests.
find.c                  Function to solve for a group sequential
                        critical value at a given stage
find.lambda_0.given.Delta
                        Function to solve for the baseline recurrent
                        event rate given a mean frequency difference
                        for one-sample simulations.
find.lambda_0.given.mu0
                        Function to solve for the baseline recurrent
                        event rate given a target mean frequency for
                        one-sample simulations.
