| histbackback {Hmisc} | R Documentation |
Takes two vectors or a list with x and y components, and produces
back to back histograms of the two datasets.
histbackback(x, y, brks=NULL, xlab=NULL, axes=TRUE, probability=FALSE,
xlim=NULL, ylab='', ...)
x,y |
either two vectors or a list given as x with two components. If the
components have names, they will be used to label the axis
(modification FEH).
|
brks |
vector of the desired breakpoints for the histograms. |
xlab |
a vector of two character strings naming the two datasets. |
axes |
logical flag stating whether or not to label the axes. |
probability |
logical flag: if TRUE, then the x-axis corresponds to the units for a
density. If FALSE, then the units are counts.
|
xlim |
x-axis limits. First value must be negative, as the left histogram is
placed at negative x-values. Second value must be positive, for the
right histogram. To make the limits symmetric, use e.g. ylim=c(-20,20).
|
ylab |
label for y-axis. Default is no label. |
... |
additional graphics parameters may be given. |
a list is returned invisibly with the following components:
left |
the counts for the dataset plotted on the left. |
right |
the counts for the dataset plotted on the right. |
breaks |
the breakpoints used. |
a plot is produced on the current graphics device.
Pat Burns
Salomon Smith Barney
London
pburns@dorado.sbi.com
options(digits=3)
set.seed(1)
histbackback(rnorm(20), rnorm(30))
fool <- list(x=rnorm(40), y=rnorm(40))
histbackback(fool)
age <- rnorm(1000,50,10)
sex <- sample(c('female','male'),1000,TRUE)
histbackback(split(age, sex))
agef <- age[sex=='female']; agem <- age[sex=='male']
histbackback(list(Female=agef,Male=agem), probability=TRUE, xlim=c(-.06,.06))