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.