Comments (1)
good point. There's an option to provide the width/length of error bars directly, but it does not support different width for lower and upper margin respectively.
# alternatively, means and error margins can be supplied directly.
# In this case means are supplied as unique combinations
# of y and x while error_margin is a separate vector with same length as y.
mtcars_means <- data.frame(
cyl = sort(unique(mtcars$cyl)),
mpg = with(mtcars, tapply(mpg, cyl, mean)),
stdev = with(mtcars, tapply(mpg, cyl, sd))
)
# you might have to adjust the yscale as it is determined from the
# range of the y variable only, ignoring the extension through error bars.
xyplot(mpg ~ factor(cyl), mtcars_means,
error_margin = mtcars_means$stdev,
ylim = c(9, 36), groups = cyl,
lwd = 2, pch = 19, cex = 1.5,
panel = function(x, y, ...) {
panel.errbars(x, y, ...)
}
)
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