UsingR: simple.densityplot – R documentation

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simple.densityplot

Plots densities of data

Description

Allows one to compare empirical densities of different distributions in a simple manner. The density is used as graphs with multiple histograms are too crowded. The usage is similar to side-by-side boxplots.

Usage

simple.densityplot(x, ...)

Arguments

`x`	x may be a sequence of data vectors (eg. x,y,z), a data frame with numeric column vectors or a model formula
`...`	You can pass in a bandwidth argument such as bw="SJ". See density for details. A legend will be placed for you automatically. To overide the positioning set do.legend="manual". To skip the legend, set do.legend=FALSE.

Value

Makes a plot

Author(s)

John Verzani

References

Basically a modified boxplot function. As well it should be as it serves the same utility: comparing distributions.

Examples

## taken from boxplot
## using a formula
data(InsectSprays)
simple.densityplot(count ~ spray, data = InsectSprays)
## on a matrix (data frame)
mat <- cbind(Uni05 = (1:100)/21, Norm = rnorm(100),
             T5 = rt(100, df = 5), Gam2 = rgamma(100, shape = 2))
simple.densityplot(data.frame(mat))

UsingR

Data Sets, Etc. for the Text "Using R for Introductory Statistics", Second Edition

v2.0-6

GPL (>= 2)

Authors

John Verzani <verzani@math.csi.cuny.edu>

Initial release