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              This app use
              nsurvival()
              function in
              gsDesign
              package
            

            

              

                Reference
              

              

                Lachin JM and Foulkes MA (1986), Evaluation of Sample Size and Power for Analyses of Survival with Allowance for Nonuniform Patient Entry, Losses to Follow-Up, Noncompliance, and Stratification.
                Biometrics
                , 42, 507-519. Schoenfeld D (1981), The Asymptotic Properties of Nonparametric Tests for Comparing Survival Distributions.
                Biometrika
                , 68, 316-319.
              

              https://CRAN.R-project.org/package=gsDesign