npsurvSS

1.1.0

Sample Size and Power Calculation for Common Non-Parametric Tests in Survival Analysis

1packages depend

7.8Kdownloads / year

–test coverage

13/13checks pass

Overview

About

Maintained by Godwin YungFirst published 2019-12-182 releasesCRAN page ↗GitHub ↗

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 (2020) doi:10.1111/biom.13196. 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) doi:10.1093/biomet/68.1.316.

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("npsurvSS", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("godwinyyung/npsurvSS")

Development version from godwinyyung/npsurvSS. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-npsurvss

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-npsurvSS

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-npsurvSS

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

13OK

Slowest check: 5.3 min · r-devel-linux-x86_64-fedora-clang

Code health

None

Tests · ratio 0.00

not tracked

Coverage

100%

Documentation · exports

Dependencies · direct

Check history

OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMENoVignettesYes · dynamicpkgdown siteNoNEWSNoCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 88%
Return-value docs: 100%
References docs: 29%

Downloads

7.8K

CRAN downloads in the past year

Rank #6,735 · ~21/day · ~652/mo

Releases R versions

Daily download trend is not available in this view yet.

46630 days

1.4K90 days

7.8K1 year

Compare downloads with other packages →

Also on188 r2u29 autocran

Repository

GitHub ↗ godwinyyung/npsurvss

1Stars

1Forks

1Open issues

0Open PRs

0Releases

11Commits

3Contributors

11 commits · Last activity 2024-04-13

Stars over time

2022-08-21 · 12026-07-07 · 1

Repository practices

Upstream repositoryBeta

2 development-tooling and community-health practices detected across 2 families in the upstream repository

Checks run against github.com/godwinyyung/npsurvss on 2026-07-30.

CRAN release process (1)

CRAN-SUBMISSION

Lint, format, editor (1)

RStudio project

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

6 external dependencies (excludes base and recommended)

Depends (1)

R >= 3.4.0

Imports (2)

statsutils

LinkingTo (0)

none

Suggests (6)

knitr rmarkdown dplyr tidyr tibble ggplot2

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

1direct

0indirect

gsDesign2

Code & Tests

People & History

People (2)

Maintainer (1)

Godwin Yung

Author, Maintainer

Authors (2)

Godwin Yung

Author, Maintainer

Yi Liu

Author

Package Timeline

2 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
1.1.0Latest
2024-05-09 · current release · diff ↗
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
R
R 4.2.0 released · 2022-04-22
R
R 4.1.0 released · 2021-05-18
R
R 4.0.0 released · 2020-04-24
1.0.1
2019-12-18
R
R 3.6.0 released · 2019-04-26

Package metadata

First published: 2019-12-18
Total releases: 2 / 7 yrs
License: GPL-2 OSI
Minimum R: ≥ 3.4.0
Download size: 283 KB
Installed size: not tracked yet
With dependencies: not tracked yet

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