Draw pairs of bargraphs based on two groups

When showing e.g., age or education distributions for two groups, it is convenient to plot them back to back. bi.bars will do so.

bi.bars(x,grp,horiz,color,label=NULL,zero=FALSE,xlab,ylab,...)

Arguments

x	The data to be drawn
grp	a grouping variable.
horiz	horizontal (default) or vertical bars
color	colors for the two groups -- defaults to blue and red
label	If specified, labels for the dependent axis
zero	If TRUE, subtract the minimum value to make the numbers range from 0 to max -min. This is useful if showing heights
xlab	xaxis label if appropriate
ylab	y axis label otherwise
…	Further parameters to pass to the graphing program

Details

A trivial, if useful, function to draw back to back histograms/barplots. One for each group.

Value

a graphic

Examples

data(bfi)
with(bfi,{bi.bars(age,gender,ylab="Age",main="Age by males and females")
       bi.bars(education,gender,xlab="Education",main="Education by gender",horiz=FALSE)})