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npsurvSS  

Sample Size and Power Calculation for Common Non-Parametric Tests in Survival Analysis
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Download and install npsurvSS package within the R console
Install from CRAN:
install.packages("npsurvSS")

Install from Github:
library("remotes")
install_github("cran/npsurvSS")

Install by package version:
library("remotes")
install_version("npsurvSS", "1.1.0")



Attach the package and use:
library("npsurvSS")
Maintained by
Godwin Yung
[Scholar Profile | Author Map]
All associated links for this package
First Published: 2019-12-18
Latest Update: 2024-05-08
Description:
A number of statistical tests have been proposed to compare two survival curves, including the difference in (or ratio of) t-year survival, difference in (or ratio of) p-th percentile survival, difference in (or ratio of) restricted mean survival time, and the weighted log-rank test. Despite the multitude of options, the convention in survival studies is to assume proportional hazards and to use the unweighted log-rank test for design and analysis. This package provides sample size and power calculation for all of the above statistical tests with allowance for flexible accrual, censoring, and survival (eg. Weibull, piecewise-exponential, mixture cure). It is the companion R package to the paper by Yung and Liu (2019) . Specific to the weighted log-rank test, users may specify which approximations they wish to use to estimate the large-sample mean and variance. The default option has been shown to provide substantial improvement over the conventional sample size and power equations based on Schoenfeld (1981) .
How to cite:
Godwin Yung (2019). npsurvSS: Sample Size and Power Calculation for Common Non-Parametric Tests in Survival Analysis. R package version 1.1.0, https://cran.r-project.org/web/packages/npsurvSS. Accessed 04 Jun. 2026.
Previous versions and publish date:
1.0.1 (2019-12-18 16:10)
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