geom_errorbar {ggplot2} | R Documentation |
Error bars
geom_errorbar(mapping=NULL, data=NULL, stat="identity", position="identity", ...)
mapping |
mapping between variables and aesthetics generated by aes |
data |
dataset used in this layer, if not specified uses plot dataset |
stat |
statistic used by this layer |
position |
position adjustment used by this layer |
... |
ignored |
This page describes geom_errorbar, see layer
and qplot
for how to create a complete plot from individual components.
A layer
The following aesthetics can be used with geom_errorbar. Aesthetics are mapped to variables in the data with the aes
function: geom\_errorbar(\code{aes}(x = var))
x
: x position (required)
ymin
: minimum of interval (required)
ymax
: maximum of interval (required)
colour
: border colour
size
: size
linetype
: line type
width
: width of geom
Hadley Wickham, http://had.co.nz/
geom_pointrange
: range indicated by straight line, with point in the middle
geom_linerange
: range indicated by straight line
geom_crossbar
: hollow bar with middle indicated by horizontal line
stat_summary
: examples of these guys in use
geom_smooth
: for continuous analog
## Not run: # Create a simple example dataset df <- data.frame( trt = factor(c(1, 1, 2, 2)), resp = c(1, 5, 3, 4), group = factor(c(1, 2, 1, 2)), se = c(0.1, 0.3, 0.3, 0.2) ) df2 <- df[c(1,3),] # Define the top and bottom of the errorbars limits <- aes(ymax = resp + se, ymin=resp - se) p <- ggplot(df, aes(fill=group, y=resp, x=trt)) p + geom_bar(position="dodge", stat="identity") # Because the bars and errorbars have different widths # we need to specify how wide the objects we are dodging are dodge <- position_dodge(width=0.9) p + geom_bar(position=dodge) + geom_errorbar(limits, position=dodge, width=0.25) p <- ggplot(df2, aes(fill=group, y=resp, x=trt)) p + geom_bar(position=dodge) p + geom_bar(position=dodge) + geom_errorbar(limits, position=dodge, width=0.25) p <- ggplot(df, aes(colour=group, y=resp, x=trt)) p + geom_point() + geom_errorbar(limits, width=0.2) p + geom_pointrange(limits) p + geom_crossbar(limits, width=0.2) # If we want to draw lines, we need to manually set the # groups which define the lines - here the groups in the # original dataframe p + geom_line(aes(group=group)) + geom_errorbar(limits, width=0.2) ## End(Not run)