Introduction to R Aedín Culhane

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Presentation transcript:

Introduction to R Aedín Culhane

Jan 2009 Data Analysts Captivated by R’s Power "R is really important to the point that it’s hard to overvalue it,” said Daryl Pregibon, a research scientist at Google, which uses the software widely. “It allows statisticians to do very intricate and complicated analyses without knowing the blood and guts of computing systems.” Nov Names You Need to Know in 2011: R Data Analysis Software "R is rapidly augmenting or replacing other statistical analysis packages at universities"

–Open source, development- flexible, extensible –Large number of statistical and numerical methods –High quality visualization and graphical tools –Extended by a very large collection of rapidly developing packages

R Why is it called R? –The name is partly based on the (first) names of the first two R authors and partly a play on the name of the Bell Labs language ‘S –Initially written by Robert Gentleman, & Ross Ihaka, Dept of Statistics, University of Auckland, New Zealand (1996)

Short R History ˆ1991: Ross Ihaka, Robert Gentleman begin work on a project that will become R 1993: The first announcement of R 1995: R available by ftp 1996: A mailing list is started and maintained by Martin Maechler at ETH 1997: The R core group is formed 2000: R is released

Short R History Continued 2001: Bioconductor for the analysis and comprehension of genomic data using R 2008: The Omegahat project to enable connectivity between R and other languages 2010: Former co-founder and employees of SPSS found Revolution Analytics, a company which offers a commerical package around R. 2011: Rstudio Project provide a free open source integrated development environment (IDE) for R

R R project (v2.14 Oct/11, v Dec/22 / 11)‏ Biannual release (normally April, October) Download core and contributed packages from CRAN Link: R Task Views R Task Views

R Interface Default R interface Rstudio – –Cross platform, Windows/Mac/Linux Others –Notepad++, TinnR, RCMDR, etc

RStudio 4 windows -Editor, Console, History, Files/plots Code completion Easy access to help (F1) One step Sweave pdf generation Searchable history Keyboard Shortcuts –

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