overlapDensity: Overlapping Density Plots

In DAAG: Data Analysis and Graphics Data and Functions

Overlapping Density Plots

Description

Densities for two distinct samples are estimated and plotted.

Usage

overlapDensity(x0, x1, ratio = c(0.05, 20), ratio.number = FALSE,
          plotvalues = c("Density", "Numbers"), gpnames = c("Control", "Treatment"),
          cutoffs = c(lower = TRUE, upper = TRUE), bw = FALSE,
          xlab = "Score", ylab = NULL,
          col = 1:2, lty = 1:2, lwd = c(1, 1), ...)

overlap.density(x0, x1, ratio = c(0.05, 20), ratio.number = FALSE,
          plotvalues = c("Density", "Numbers"), gpnames = c("Control", "Treatment"),
          cutoffs = c(lower = TRUE, upper = TRUE), bw = FALSE,
          xlab = "Score", ylab = NULL,
          col = 1:2, lty = 1:2, lwd = c(1, 1), ...)

Arguments

x0	control group measurements
x1	treatment group measurements
ratio	if not NULL, the range within which the relative number per unit interval (ratio.number=TRUE) or relative probability density (ratio.number=FALSE) of observations from the two groups are required to lie will be used to determine lower and upper bounds on the values of x0 and x1. [The relative numbers at any point are estimated from (density1*n1)/(density0*x0)]
ratio.number	If TRUE (default), then ratio is taken as the ratio of number of points per unit interval
plotvalues	If set to Number then the y-axis scale is chosen so that total area undere the curve is equal to the sample size; otherwise (plotvalues="Density") total area under each cueve is 1. Any other setting does not give a plot.
gpnames	Names of the two samples
cutoffs	logical vector, indicating whether density estimates should be truncated below (lower=TRUE) or above (upper=TRUE)
bw	logical, indicates whether to overwrite with a gray scale plot
xlab	Label for x-axis
ylab	Label for y-axis
col	standard color parameter
lty	standard line type preference
lwd	standard line width preference
...	Other parameters to be passed to plot()

Author(s)

J.H. Maindonald

See Also

t.test

Examples

attach(two65)
overlapDensity(ambient,heated)
t.test(ambient,heated)

DAAG documentation built on May 29, 2024, 9:13 a.m.