R Observatory: Metrics for Qapprox version 0.2.1

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

Qapprox

0.2.1Package record

Approximation to the Survival Functions of Quadratic Forms of Gaussian Variables

0packages depend

3Kdownloads / year

–test coverage

13/13flavors OK

Overview

About

Maintained by Zheyang WuCRAN page ↗GitHub ↗Issues ↗

Calculates the right-tail probability of quadratic forms of Gaussian variables using the skewness-kurtosis ratio matching method, modified Liu-Tang-Zhang method and Satterthwaite-Welch method. The technical details can be found in Hong Zhang, Judong Shen and Zheyang Wu (2022) "A fast and accurate approximation to the distributions of quadratic forms of Gaussian variables" doi:10.1080/10618600.2021.2000423.

Changes in 0.2.1

New maintainer: Zheyang Wu (<zheyangwu@wpi.edu>).
Authors@R now lists all three authors of the underlying paper (Hong Zhang, Judong Shen, and Zheyang Wu).
The package now has a public repository and issue tracker: <https://github.com/ZWuLab/Qapprox>. Added URL and BugReports fields.
The reference in Description now points to the published paper (Zhang, Shen and Wu, 2022, Journal of Computational and Graphical Statistics, <doi:10.1080/10618600.2021.2000423>) instead of the arXiv preprint.
No changes to functions or computations.

From NEWS.md in the release

Install

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

install.packages("Qapprox", 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("ZWuLab/Qapprox")

Development version from ZWuLab/Qapprox. 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-qapprox

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-Qapprox

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-Qapprox

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: 54 s · r-release-windows-x86_64

Status changes

OK13 OK2026-08-28
NOTE12 OK, 2 NOTE2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.2.1

READMENoVignettesNoNEWSYes · 67% structured · mentions 0.2.1Citation fileNoWebsitenot declared in DESCRIPTION

Help pages: 2
Examples that run: 100%2 run in a plain check
Exported functions with examples: 100%
Documented parameters: 100%
Return-value docs: 100%
Help pages citing references: 100%

How these are measured

Downloads

3K

CRAN downloads in the past year

Rank #15,575 · ~8/day · ~250/mo

Releases R versions

Daily download trend is not available in this view yet.

23730 days

79490 days

3K1 year

Compare downloads with other packages →

Also on102 r2u6 autocran31 c2d4u

How downloads are counted

Repository

zwulab/qapprox ↗Organization: ZWuLab

0Stars

0Forks

0Open issues

0Open PRs

0Releases

Last activity 2026-08-09 · The default branch showed an older version (0.2.0) than CRAN on 2026-10-21

Responsiveness

not measured

How these are measured

PracticesBeta

Checks run against github.com/zwulab/qapprox on 2026-10-21.

No development-tooling practices detected in the upstream repository.

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

Dependencies

Declared dependencies

0 external dependencies (excludes base and recommended)

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

Depends (0)

none

Imports (1)

stats

LinkingTo (0)

none

Suggests (0)

none

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

How these are counted

Code & Tests

People & History

People (3)

Zheyang Wu

Author, Maintainer since 0.2.1 (2026) · added in 0.2.1

Judong Shen

Author · added in 0.2.1

Hong Zhang

Author

Previously maintained by Hong Zhang (0.1.0 to 0.2.0).

Releases (3)

Pick two releases to compare their code metrics.

0.2.1Latest
record
2026-08-24 · current release · diff ↗
R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
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
0.2.0
record
2021-07-07 · diff ↗
R
R 4.1.0 released · 2021-05-18
0.1.0
record
2020-09-29
R
R 4.0.0 released · 2020-04-24

Package metadata

First published: 2020-09-29
Total releases: 3 / 6 yrs
License: GPL-2 OSI
Download size: 2.7 KB

Appears in task views

Probability Distributions

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("Qapprox")

Format

Wu, Z., Shen, J., & Zhang, H. (2026). Qapprox: Approximation to the Survival Functions of Quadratic Forms of Gaussian Variables (Version 0.2.1) [Computer software]. https://doi.org/10.32614/CRAN.package.Qapprox

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 Qapprox version 0.2.1 [Data set]. HJJB, LLC. Data release v2026-10-25. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-25, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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