R Observatory: Metrics for tcftt version 0.1.0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

tcftt

0.1.0Package record

Two-Sample Tests for Skewed Data

0packages depend

1.6Kdownloads / year

–test coverage

11/13flavors OK

Overview

About

Maintained by Huaiyu ZhangCRAN page ↗

The classical two-sample t-test works well for the normally distributed data or data with large sample size. The tcfu() and tt() tests implemented in this package provide better type-I-error control with more accurate power when testing the equality of two-sample means for skewed populations having unequal variances. These tests are especially useful when the sample sizes are moderate. The tcfu() uses the Cornish-Fisher expansion to achieve a better approximation to the true percentiles. The tt() provides transformations of the Welch's t-statistic so that the sampling distribution become more symmetric. For more technical details, please refer to Zhang (2019) http://hdl.handle.net/2097/40235.

Changes in 0.1.0

This version is the initial release of the tcftt package.

The function tcfu() implements the Cornish-Fisher based two-sample test (TCFU) and tt() implements the transformation based two-sample test (TT).

The function t_edgeworth() provides the Edgeworth expansion for cumulative density function for the Welch's t-statistic, and t_cornish_fisher() provides the Cornish-Fisher expansion for its percentiles.

The functions adjust_power() and pauc() provide power adjustment methods for simulation studies.

From NEWS.md in the release

Install

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

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

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

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-tcftt

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-tcftt

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-tcftt

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

2NOTE11OK

Check messages

NOTECRAN incoming feasibilityr-devel-linux-x86_64-debian-clang, r-devel-linux-x86_64-debian-gcc

Maintainer: ‘Huaiyu Zhang <huaiyuzhang1988@gmail.com>’

No Authors@R field in DESCRIPTION.
Please add one, modifying
  Authors@R: c(person(given = "Huaiyu",
                      family = "Zhang",
                      role = c("aut", "cre"),
                      email = "huaiyuzhang1988@gmail.com"),
               person(given = "Haiyan",
                      family = "Wang",
                      role = "aut"))
as necessary.

CRAN check page ↗

Slowest check: 47 s · r-devel-windows-x86_64

Status changes

NOTE11 OK, 2 NOTENow
NOTE9 OK, 5 NOTE2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.1.0

READMEYes · 208 wordsVignettesNoNEWSYes · 33% structured · mentions 0.1.0Citation fileNoWebsitenot declared in DESCRIPTION

Help pages: 9 (1 internal)includes a package overview page
Examples that run: 100%7 run in a plain check
Exported functions with examples: 100%
Documented parameters: 100%
Return-value docs: 100%
Help pages citing references: 44%

How these are measured

Downloads

1.6K

CRAN downloads in the past year

Rank #24,520 · ~4/day · ~136/mo

Releases R versions

Daily download trend is not available in this view yet.

19830 days

49590 days

1.6K1 year

Compare downloads with other packages →

Also on66 r2u5 autocran

How downloads are counted

Dependencies

Declared dependencies

0 external dependencies (excludes base and recommended)

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

Depends (1)

R >= 3.1.0

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 (from the free-text Author field) (2)

Huaiyu Zhang

Haiyan Wang

Maintainer since 0.1.0 (2020)

Releases (1)

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
R
R 4.1.0 released · 2021-05-18
0.1.0Latest
record
2020-07-23 · current release
R
R 4.0.0 released · 2020-04-24

Package metadata

First published: 2020-07-23
Total releases: 1 / 6 yrs
License: GPL-2 OSI
Minimum R: ≥ 3.1.0
Download size: 8.5 KB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("tcftt")

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 tcftt version 0.1.0 [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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