Scatter Plot with Error Bars

Draws a scatter plot, adding vertical “error bars” to all the points.

errbar(x, y, yplus, yminus, cap = 0.015,
       ylim = range(y,yplus,yminus),
       xlab= deparse(substitute(x)),
       ylab= deparse(substitute(y)), ...)

Arguments

x

vector of x values.

y

vector of y values.

yplus

vector of y values: the tops of the error bars.

yminus

vector of y values: the bottoms of the error bars.

cap

the width of the little lines at the tops and bottoms of the error bars in units of the width of the plot. Default is 0.015.

ylim

(numeric of length 2): the y-axis extents with a sensible default.

xlab, ylab

axis labels for the plot, as in plot.default.

...

Graphical parameters (see par) may also be supplied as arguments to this function.

Author

Originally Charles Geyer, U.Chicago, early 1991; then Martin Mächler.

See also

errbar in package Hmisc is similar.

Examples

y <- rnorm(10); d <- 1 + .1*rnorm(10)
errbar(1:10, y, y + d, y - d, main="Error Bars example")