KM2                     Estimates the survival function for a bivariate
                        outcome
KM3                     Estimates the survival function for a
                        trivariate outcome
cox2                    Cox regression for a bivariate outcome
cox2.LF                 Bivariate regression survival function and
                        marginal hazards estimation
genClayton2             Generates survival data from a bivariate
                        Clayton-Oakes model
genClayton3             Generates survival data from a trivariate
                        Clayton-Oakes model
genClaytonReg           Generates regression data from a bivariate
                        Clayton-Oakes model
plotKM2.3D              Uses a 3D perspective plot to visualize a
                        bivariate survival function
plotKM2.HM              Uses a heat map to visualize a bivariate
                        survival function
