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R (programming language)
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Appeared in | August 1993[1] |
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Designed by | Ross Ihaka and Robert Gentleman (statistician) |
Developer | R Core Team[2] |
Stable release | 4.0.2 ("Taking Off Again")[3] / June 22, 2020 |
Influenced by | |
Influenced | Julia[4] |
License | GNU GPL v2[5] |
Usual filename extensions |
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Website | {{ |
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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. R is putting utmost efforts to walk parallelly to Python.
Contents
Usage in other areas
The R language was originally made for statistics. But today, it is also used in many scientific fields including ecology[12][13].
Development history
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.
Release | Date | Description |
---|---|---|
0.16 | This is the last test version. | |
0.49 | 1997-04-23 | This is the oldest source release which is currently available on CRAN.[15] CRAN is started on this date, with 3 mirrors that initially hosted 12 packages.[16] |
0.60 | 1997-12-05 | R becomes an official part of the GNU Project. The code is hosted and maintained on CVS. |
0.65.1 | 1999-10-07 | First versions of update.packages and install.packages functions for downloading and installing packages from CRAN.[17] |
1.0 | 2000-02-29 | The developers declared that it is stable enough for production use.[18] |
1.4 | 2001-12-19 | S4 methods are introduced and the first version for Mac OS X is made available soon after. |
1.8 | 2003-10-08 | Introduced a flexible condition handling mechanism for signalling and handling condition objects. |
2.0 | 2004-10-04 | Introduced fast loading of data with minimal expense of system memory. |
2.1 | 2005-04-18 | Support for UTF-8 encoding. They also started of internationalization and localization for different languages. |
2.6.2 | 2008-02-08 | Last version to support Windows 95, 98, Me and NT 4.0[19] |
2.11 | 2010-04-22 | Support for Windows 64 bit systems. |
2.12.2 | 2011-02-25 | Last version to support Windows 2000[20] |
2.13 | 2011-04-14 | Adding a new compiler function that allows speeding up functions by converting them to byte-code. |
2.14 | 2011-10-31 | Added mandatory namespaces for packages. Added a new parallel package. |
2.15 | 2012-03-30 | New load balancing functions. Improved serialization speed for long vectors. |
3.0.0 | 2013-04-03 | Support for numeric index values 231 and larger on 64 bit systems. |
3.3.3 | 2017-03-06 | Last version to support Microsoft Windows XP. |
3.4.0 | 2017-04-21 | Just-in-time compilation (JIT) of functions and loops to byte-code enabled by default. |
3.5.0 | 2018-04-23 | Packages byte-compiled on installation by default. Compact internal representation of integer sequences. Added a new serialization format to support compact internal representations. |
3.6.0 | 2019-04-26 | |
4.0.0 | 2020-04-24 |
Communities
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]
useR! conferences
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
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.
Basic syntax
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.
References
- ↑ 1.0 1.1 Lua error in ...nsions/Scribunto/engines/LuaCommon/lualib/mwInit.lua at line 23: bad argument #1 to 'old_ipairs' (table expected, got nil).
- ↑ Hornik, Kurt (November 26, 2015). "R FAQ". 2.1 What is R?. https://cran.r-project.org/doc/FAQ/R-FAQ.html#What-is-R_003f. Retrieved 2018-08-05.
- ↑ "The Comprehensive R Archive Network". https://cran.r-project.org/.
- ↑ "Introduction". The Julia Manual. https://docs.julialang.org/en/stable/manual/introduction/#man-introduction-1.
- ↑ "R license". r-project. https://www.r-project.org/COPYING.
- ↑ Crawley, M. J. (2012). The R book. John Wiley & Sons.
- ↑ Dalgaard, P. (2008). Introductory statistics with R. Springer.
- ↑ Maronna, R. A., Martin, R. D., & Yohai, V. J. (2019). Robust statistics: theory and methods (with R). John Wiley & Sons.
- ↑ Ugarte, M. D., Militino, A. F., & Arnholt, A. T. (2008). Probability and Statistics with R. CRC Press.
- ↑ Bruce, P., Bruce, A., & Gedeck, P. (2020). Practical Statistics for Data Scientists: 50+ Essential Concepts Using R and Python. O'Reilly Media.
- ↑ Kruschke, J. (2014). Doing Bayesian data analysis: A tutorial with R, JAGS, and Stan. Academic Press.
- ↑ Borcard, D., Gillet, F., & Legendre, P. (2018). Numerical ecology with R. Springer.
- ↑ Bolker, B. M. (2008). Ecological models and data in R. Princeton University Press.
- ↑ Changes in versions 3.0.0 onward: "R News". https://cran.r-project.org/src/base/NEWS. Retrieved 2014-07-03.
Earlier change logs (by major release number):
- "NEWS". https://cran.r-project.org/src/base/NEWS. Retrieved 2020-06-28.
- "NEWS.3". https://cran.r-project.org/src/base/NEWS.3. Retrieved 2020-06-28.
- "NEWS.2". https://cran.r-project.org/src/base/NEWS.2. Retrieved 2017-04-08.
- "NEWS.1". https://cran.r-project.org/src/base/NEWS.1. Retrieved 2017-04-08.
- "NEWS.0". https://cran.r-project.org/src/base/NEWS.0. Retrieved 2017-04-08.
- ↑ "Index of /src/base/R-0". https://cran.r-project.org/src/base/R-0/.
- ↑ "ANNOUNCE: CRAN". https://stat.ethz.ch/pipermail/r-announce/1997/000001.html.
- ↑ https://cran.r-project.org/src/base/NEWS.0
- ↑ Peter Dalgaard. "R-1.0.0 is released". https://stat.ethz.ch/pipermail/r-announce/2000/000127.html. Retrieved 2009-06-06.
- ↑ https://cran-archive.r-project.org/bin/windows/base/old/2.7.0/CHANGES.R-2.7.0
- ↑ "R FAQ". https://cran.r-project.org/bin/windows/base/rw-FAQ.html#How-do-I-install-R-for-Windows_003f. Retrieved 2020-03-20.
- ↑ "Local R User Group Directory". http://blog.revolutionanalytics.com/local-r-groups.html. Retrieved 12 May 2018.
- ↑ "A list of R conferences and meetings". https://jumpingrivers.github.io/meetingsR/index.html. Retrieved 12 May 2018.
- ↑ "official website of WhyR? conference". http://whyr.pl/. Retrieved 26 June 2019.
- ↑ "SatRdays listing". https://satrdays.org/. Retrieved 26 June 2019.
- ↑ "R Project for Statistical Computing". https://www.meetup.com/topics/r-project-for-statistical-computing/. Retrieved 12 May 2018.
- ↑ 26.0 26.1 26.2 "R: Conferences". 2019-11-01. https://www.r-project.org/conferences/.
- ↑ "useR! 2004 - The R User Conference". 27 May 2004. http://www.ci.tuwien.ac.at/Conferences/useR-2004/. Retrieved 2018-09-09.
- ↑ R Project (9 August 2013). "R-related Conferences". https://www.r-project.org/conferences. Retrieved 2019-08-15.
- ↑ "UseR! 2021 - The R User Conference". https://user2021.r-project.org/. Retrieved 2020-03-23.
- ↑ most used assignment operator in R is
<-
- R Development Core Team. "Writing R Extensions". https://cran.r-project.org/doc/manuals/R-exts.html#Tidying-R-code. Retrieved 2018-09-11. "[...] we recommend the consistent use of the preferred assignment operator ‘<-’ (rather than ‘=’) for assignment."
- "Google's R Style Guide". https://google.github.io/styleguide/Rguide.xml#assignment. Retrieved 2018-09-11.
- Wickham, Hadley. "Style Guide". http://stat405.had.co.nz/r-style.html. Retrieved 2018-09-11.
- Bengtsson, Henrik (January 2009). "R Coding Conventions (RCC) – a draft". https://docs.google.com/document/preview?id=1esDVxyWvH8AsX-VJa-8oqWaHLs4stGlIbk8kLc5VlII&pli=1. Retrieved 2018-09-11.
- ↑ R Development Core Team. "Assignments with the = Operator". https://developer.r-project.org/equalAssign.html. Retrieved 2018-09-11.