Graphics Reference
In-Depth Information
Figure 5-11. Continuous variable mapped to size and categorical variable mapped to colour
When a variable is mapped to
size
, it's a good idea to notmap a variable to
shape
. This is
because it is difficult to compare the sizes of different shapes; for example, a size 4 triangle could
appear larger than a size 3.5 circle. Also, some of the shapes really are different sizes: shapes 16
and 19 are both circles, but at any given numeric size, shape 19 circles are visually larger than
shape 16 circles.
See Also
To use different colors from the default, see
Using a Manually Deined Palette for a Continuous
