Deal with One and Two (Normal) Samples R package OneTwoSamples version 1.3-0 We introduce an R function one_two_sample() which can deal with one and two (normal) samples, Ying-Ying Zhang, Yi Wei (2012) <doi:10.2991/asshm-13.2013.29>. For one normal sample x, the function reports descriptive statistics, plot, interval estimation and test of hypothesis of x. For two normal samples x and y, the function reports descriptive statistics, plot, interval estimation and test of hypothesis of x and y, respectively. It also reports interval estimation and test of hypothesis of mu1-mu2 (the difference of the means of x and y) and sigma1^2 / sigma2^2 (the ratio of the variances of x and y), tests whether x and y are from the same population, finds the correlation coefficient of x and y if x and y have the same length. Software Depends: R (>= 3.3), methods Suggests: testthat (>= 3.0.0), roxygen2 Frederic Bertrand <frederic.bertrand@lecnam.net> Comprehensive R Archive Network (CRAN) Frederic Bertrand [cre] (ORCID: <https://orcid.org/0000-0002-0837-8281>), Ying-Ying Zhang (Robert) [aut] GPL (>= 2) 2026-06-06 application/tgz https://CRAN.R-project.org/package=OneTwoSamples doi:10.32614/CRAN.package.OneTwoSamples