STAT 451, Day 14

More Tools to Visualize Data

More on Plotting Maps in R

There are many libraries that are useful to make maps in R.

When working with maps you will start to use ~~shape files~~. These are .shp files.

Try to make the plot described on this Playing with R blog post, plotting Bay Area zip codes and income. Shape file is here.

More Graphs in R

From the Quick-R website.

Advanced Graphs

Try some plots using ggplot2

Some R Code

# ggplot2 examples
library(ggplot2) 

# create factors with value labels 
mtcars$gear <- factor(mtcars$gear,levels=c(3,4,5),
    labels=c("3gears","4gears","5gears")) 
mtcars$am <- factor(mtcars$am,levels=c(0,1),
    labels=c("Automatic","Manual")) 
mtcars$cyl <- factor(mtcars$cyl,levels=c(4,6,8),
    labels=c("4cyl","6cyl","8cyl"))

More R Code

# Kernel density plots for mpg
# grouped by number of gears 
# (indicated by color)
qplot(mpg, data=mtcars, geom="density", 
   fill=gear, alpha=I(.5), 
   main="Distribution of Gas Milage", xlab="Miles Per Gallon", 
   ylab="Density")

plot of chunk unnamed-chunk-2