R (programming language)

R

R terminal
Paradigms	Multi-paradigm: Array programming, object-oriented, imperative, functional
Designed by	Ross Ihaka and Robert Gentleman (statistician)
Developer	R Core Team[1]
First appeared	August 1993; 31 years ago (1993-08)[2]
Stable release	4.4.2[3]  (codename "Pile of Leaves") / 31 October 2024; 12 days ago (31 October 2024)
License	GNU GPL v2[4]
Filename extensions	.r .rdata .rds .rda
Website	www.r-project.org
Influenced by
Common Lisp Scheme[2] XLispStat S
Influenced
Julia[5]
R Programming at Wikibooks

R is a programming language and free software environment for statistics.^{[6][7][8][9][10][11]} R is a language built for a specific purpose. It is strictly designed for statistical analysis. The algorithms for many statistical models are devised in R. Precisely R is the language of Statistical Analyzers. It’s an open source and the best suite for the statisticians to develop statistical softwares.

The R language was originally made for statistics. But today, it is also used in many scientific fields including ecology.^[12][13]

A list of changes in R releases is maintained in various "news" files at CRAN (Comprehensive R Archive Network).^[14] Some highlights are listed below for several major releases.

R has local communities worldwide for users to share ideas and learn.^[21][22]

There are a growing number of R events bringing its users together, such as conferences (e.g. useR!, WhyR?, conectaR, SatRdays)^[23][24] and other meetups.^[25]

The official annual gathering of R users is called "useR!".^[26] The first such event was useR! 2004 in May 2004, Vienna, Austria.^[27] After skipping 2005, the useR! conference has been held annually.^[28] Subsequent conferences have included:^[26]

• useR! 2006, Vienna, Austria
• useR! 2007, Ames, Iowa, USA
• useR! 2008, Dortmund, Germany
• useR! 2009, Rennes, France
• useR! 2010, Gaithersburg, Maryland, USA
• useR! 2011, Coventry, United Kingdom
• useR! 2012, Nashville, Tennessee, USA
• useR! 2013, Albacete, Spain
• useR! 2014, Los Angeles, California, USA
• useR! 2015, Aalborg, Denmark
• useR! 2016, Stanford, California, USA
• useR! 2017, Brussels, Belgium
• useR! 2018, Brisbane, Australia
• useR! 2019, Toulouse, France

Future conferences planned are as follows:^[26][29]

• useR! 2020, St. Louis, Missouri, USA (Canceled)
• useR! 2021, Zurich, Switzerland

The R Journal is the open access refereed journal of the R project. It features articles on the use and development of the R language.

The following examples illustrate the basic syntax of the language and use of the command-line interface.

In R, the generally preferred^[30] assignment operator is an arrow made from two characters <-. Although = can be used instead.^[31]

> x <- 1:6  # Create vector.
> y <- x^2  # Create vector by formula.
> print(y)  # Print the vector’s contents.
[1]  1  4  9 16 25 36

> mean(y)  # Arithmetic mean of vector.
[1] 15.16667

> var(y)  # Sample variance of vector.
[1] 178.9667

> model <- lm(y ~ x)  # Linear regression model y = A + B * x.
> print(model)  # Print the model’s results.

Call:
lm(formula = y ~ x)

Coefficients:
(Intercept)            x 
     -9.333        7.000

> summary(model)  # Display an in-depth summary of the model.

Call:
lm(formula = y ~ x)

Residuals:
      1       2       3       4       5       6
 3.3333 -0.6667 -2.6667 -2.6667 -0.6667  3.3333

Coefficients:
            Estimate Std. Error t value Pr(>|t|)   
(Intercept)  -9.3333     2.8441  -3.282 0.030453 * 
x             7.0000     0.7303   9.585 0.000662 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 3.055 on 4 degrees of freedom
Multiple R-squared:  0.9583, Adjusted R-squared:  0.9478
F-statistic: 91.88 on 1 and 4 DF,  p-value: 0.000662

> par(mfrow = c(2, 2))  # Create a 2 by 2 layout for figures.
> plot(model)  # Output diagnostic plots of the model.

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