DAAG (version 1.22)

overlapDensity: 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

See Also

t.test

Examples

# NOT RUN {
attach(two65)
overlapDensity(ambient,heated)
t.test(ambient,heated)
# }