| 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)
min: minimum of interval (required)
max: maximum of interval (required)
colour: border colour
size: size
linetype: line type
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(max = resp + se, min=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)