Introduction

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R Code

library(ggplot2)
data(mpg,package = "ggplot2") 
#mpg <-read.csv("http://goo.gl/uEeRGU")

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subheadings

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  2. second

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summary(cars)
##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00
# Scatterplot
theme_set(theme_bw())
g<-ggplot(mpg,aes(cty,hwy))
g + geom_jitter(width=.5, size=1)+
labs(subtitle="mpg: city vs highway mileage",
     y="hwy",
     x="cty",
     title="Jittered Points")

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