histbackback: Back to Back Histograms In Hmisc: Harrell Miscellaneous

Description

Takes two vectors or a list with x and y components, and produces back to back histograms of the two datasets.

Usage

 1 2 histbackback(x, y, brks=NULL, xlab=NULL, axes=TRUE, probability=FALSE, xlim=NULL, ylab='', ...)

Arguments

 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.

Value

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.

Side Effects

a plot is produced on the current graphics device.

Author(s)

Pat Burns
Salomon Smith Barney
London

Examples

 1 2 3 4 5 6 7 8 9 10 11 12 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))

Example output    