We R together

R Club

石长顺
WISE XMU

What is R

Definition

R is a free software programming language and software environment for statistical computing and graphics.

R History

  1. S 语言是 R 语言的前身.
    • S语言是由AT&T贝尔实验室的John Chambers1980年发明。
    • 1998 年美国计算机学会(ACM)授予了S语言的主要设计者 Chambers“软件系统奖”。
  2. R 语言诞生新西兰。
    • 1993年, Ross Ihaka 和 Robert Gentleman发明了R.
    • 1995年6月, R语言GPL协议下作为开源软件发布了。
  3. 1997 年,R 核心团队成立.
    • 2011 年至今,R 核心团队成员数目达到 20 位。

What is R?

  1. Data analysis software

  2. Programming language

  3. Environment for statistical analysis

  4. Open-source software project under GNU.

  5. Community

see http://www.inside-r.org/what-is-r

Why R

1. R is open-source

  • Free: No worries about subscription fees, license managers, or user limits.
  • open: You can inspect the code and tinker with it as much as you like.

2. R is fashional.

R is very popular statistical programming language and platform to perform data mining, analysis, and visualization. Rank

2. R is fashional.(CONT'D)

2. R is fashional.(CONT'D)

High popularity often means easier communication between you and other users because you "speak" the same language.

3. A friendly statistical analysis toolkit.

All of the standard data analysis tools are built right into the R language:

  1. Accessing data in various formats.(.txt, .csv, .xlsx, .dta... )

  2. traditional and modern statistical models(regression, ANOVA, GLM, tree models,timeseries etc)

 
fit <- lm(weight ~ height, data=women)
summary(fit)

## 
## Call:
## lm(formula = weight ~ height, data = women)
## 
## Residuals:
##     Min      1Q  Median      3Q     Max 
## -1.7333 -1.1333 -0.3833  0.7417  3.1167 
## 
## Coefficients:
##              Estimate Std. Error t value Pr(>|t|)    
## (Intercept) -87.51667    5.93694  -14.74 1.71e-09 ***
## height        3.45000    0.09114   37.85 1.09e-14 ***
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 1.525 on 13 degrees of freedom
## Multiple R-squared:  0.991,  Adjusted R-squared:  0.9903 
## F-statistic:  1433 on 1 and 13 DF,  p-value: 1.091e-14

par(mfrow=c(2,2))
plot(fit)

plot of chunk unnamed-chunk-2

4. Graphics and data visualization.

Visualizations act as a campfire around which we gather to tell stories.(Al Shalloway)

Basic Plot

plot of chunk unnamed-chunk-3

ggplot2

package {ggplot2}

Interactive Graphic

package {googleVis}

there another video

5. Versatile

Finance

package {quandmod}

library(quantmod)
getSymbols("USD/CNY",src="oanda",from="2015-01-01")
chartSeries(USDCNY, theme = "white")

Finance(Con't)

package {PerformanceAnalytics}

library(PerformanceAnalytics)
data("edhec")
charts.PerformanceSummary(edhec[,c(9,12)])

Text mining

Social Analysis

6. Rich resources & vibrant community

R has a huge, rapidly increasing amount of online resources and vibrant community.

  • 7,264 packages in almost all data-related areas(untill Oct. 4th, 2015)
  • 108,508 stackoverflow questions tagged by r (untill Oct. 4th, 2015)
  • R core, R developers , R Users from a wide range of backgrounds like statistics, econometrics, finance, bioinfomatics, mechanical engineering, physics, medicine...
  • 中国R语言会议
  • Other website: Also there are a lot of websites specialized in R like R-bloggers, and Rdocumentation.

7. High Paid

High