R Observatory: Metrics for npsurvSS version 1.1.0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

npsurvSS

1.1.0Package record

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

1packages depend

7.2Kdownloads / year

–test coverage

13/13flavors OK

Overview

About

Maintained by Godwin YungCRAN page ↗GitHub ↗Issues ↗

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. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

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). We list this channel from recorded autoCRAN download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

Health

CRAN checks

13OK

CRAN check page ↗

Slowest check: 4.0 min · r-oldrel-windows-x86_64

Status changes

OK13 OK2026-08-05
NOTE12 OK, 1 NOTE2026-08-01
OK14 OK2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 1.1.0

READMENoVignettesYes · 3 · dynamicNEWSNoCitation fileNoWebsitenot declared in DESCRIPTION

Help pages: 14
Examples that run: 100%9 run in a plain check
Exported functions with examples: 64%
Documented parameters: 88%
Return-value docs: 100%
Help pages citing references: 29%

Vignettes (3)

Basic functionalities HTML
Example 1: Optimal randomization ratio HTML
Example 2: Delayed treatment effect HTML

How these are measured

Downloads

7.2K

CRAN downloads in the past year

Rank #5,754 · ~20/day · ~598/mo

Releases R versions

Daily download trend is not available in this view yet.

63930 days

1.4K90 days

7.2K1 year

Compare downloads with other packages →

Also on293 r2u8 autocran

How downloads are counted

Repository

godwinyyung/npsurvss ↗Account: godwinyyung

1Stars

1Forks

1Open issues

0Open PRs

0Releases

11Commits

3Commit identities

11 commits · Last activity 2024-04-13

Responsiveness

How these are sampled

PRs merged (all time): 100%
Median days to close, 50 most recently updated closed issues: 432
Median days to close, 50 most recently updated closed PRs: 17

Stars over time

2022-08-21 · 12026-07-07 · 1

How these are measured

PracticesBeta

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

Checks run against github.com/godwinyyung/npsurvss on 2026-10-22.

CRAN release process (1)

CRAN-SUBMISSION

Lint, format, editor (1)

RStudio project

How this is detected·Detection ruleset v4 (2026-10-20)

Dependencies

Declared dependencies

6 external dependencies (excludes base and recommended)

Installing npsurvSS adds no packages beyond those that come with R.

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

Imports 1

Depends, Imports or LinkingTo, most downloaded first

gsDesign2

How these are counted

Code & Tests

People & History

People (2)

Godwin Yung

Author, Maintainer since 1.0.1 (2019)

Yi Liu

Author

Releases (2)

Pick two releases to compare their code metrics.

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
1.1.0Latest
record
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
record
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

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("npsurvSS")

Format

Yung, G., & Liu, Y. (2024). npsurvSS: Sample Size and Power Calculation for Common Non-Parametric Tests in Survival Analysis (Version 1.1.0) [Computer software]. https://doi.org/10.32614/CRAN.package.npsurvSS

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for npsurvSS version 1.1.0 [Data set]. HJJB, LLC. Data release v2026-10-24. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-24, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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