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R Data Analysis Cookbook - Second Edition by Kuntal Ganguly

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Getting ready

Download the files for this chapter and store the auto-mpg.csv file in your R working directory. Read the data and create factors for auto$cylinders:

> auto <- read.csv("auto-mpg.csv", stringsAsFactors=FALSE) 
> auto$cylinders <- factor(auto$cylinders, levels = c(3,4,5,6,8),     labels = c("3cyl", "4cyl", "5cyl", "6cyl", "8cyl")) 

Install the plyr package in your R environment if you do not have it already. This can be done using the following commands:

> install.packages("plyr") 
> library(plyr)

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