geom_crossbar
Geometry representing a vertical interval defined by x, y, ymin
and ymax. Each case draws a single graphical object.
Aesthetics
Other Properties
| width |
crossbar width |
| fatten |
a multiplicative factor used to increase the size of the middle bar in geom_crossbar and the middle point in geom_pointrange |
Similar Geometries
geom_linerange,
geom_pointrange
Description and Details
Using the described geometry, you can insert a geometric
object (crossbar) into your data visualization that is
defined by a position aesthetics properties x, y, ymin and
ymax. You can find this geometry in the ribbon toolbar tab
Layers, under the 2D button.
Using this geometry, you can display a range of y values at
a defined value on the x-axis. We often use this geometry for
visualizing errors. For the following examples, we will use
a simple dataset consisting of five variables and four records.
We map to the x axis the trt variable. On the y, ymin and ymax
positional properties we map variables resp, upper and lower.
Finally, we map the color aesthetic to the group variable.
The result is shown in the following plot.
Described geometry is often used when we have categorical
variable mapped on the x-axis. If we want to transform
numerical variable trt to categorical, we put it as an
argument into the factor() function. For displaying the
geometries "next to each other", we set the position
property to dodge and the width parameter to 0.2.
Finally, we can adjust the thickness of the middle bar
using the fatten property (we set it to 6). The result
is shown in the following figure.
