QuickR - Lattice Graphs

I have been asked about problems with the code from the Lattice Graphs from Quick-R

Start by reloading the original mtcars dataset. If the mtcars is not reloaded any previous changes will cause problems with the code.

data(mtcars)

library(lattice)

create factors with value labels

gear.f<-factor(gear,levels=c(3,4,5),
               labels=c("3gears","4gears","5gears"))
cyl.f <-factor(cyl,levels=c(4,6,8),
               labels=c("4cyl","6cyl","8cyl"))

kernel density plot

densityplot(~mpg,
            main="Density Plot",
            xlab="Miles per Gallon")

kernel density plots by factor level

densityplot(~mpg|cyl.f,
            main="Density Plot by Number of Cylinders",
            xlab="Miles per Gallon")

kernel density plots by factor level (alternate layout)

densityplot(~mpg|cyl.f,
            main="Density Plot by Numer of Cylinders",
            xlab="Miles per Gallon",
            layout=c(1,3))

boxplots for each combination of two factors

Correction: The last line of code had an extra ( in the line layout=(c(1,3)).

bwplot(cyl.f~mpg|gear.f,
       ylab="Cylinders", xlab="Miles per Gallon",
       main="Mileage by Cylinders and Gears",
       layout=c(1,3))

scatterplots for each combination of two factors

xyplot(mpg~wt|cyl.f*gear.f,
       main="Scatterplots by Cylinders and Gears",
       ylab="Miles per Gallon", xlab="Car Weight")

NA

3d scatterplot by factor level

cloud(mpg~wt*qsec|cyl.f,
       main="3D Scatterplot by Cylinders")

dotplot for each combination of two factors

dotplot(cyl.f~mpg|gear.f,
       main="Dotplot Plot by Number of Gears and Cylinders",
       xlab="Miles Per Gallon")

scatterplot matrix

splom(mtcars[c(1,3,4,5,6)],
       main="MTCARS Data")