Repeat addresses. Another method is
to select the most serious hot spot
addresses. For example, one might want
to find the worst 10 percent of the
addresses. This is called repeat address
mapping (RAM). The addresses would
be the 10 percent of repeat addresses
that have the most crimes. They would
be plotted on a map using dots to represent
hot spots. This method has two distinct
advantages. First, the map is
clearer because it has less clutter.
Second, such maps are useful for clearly
specifying police targets. The deficiency
of RAM is that it leaves out information
about the other locations. This deficiency
can be overcome by producing supplementary
maps that show all locations or
by combining RAM with the use of a
color gradient so that the targeted hot
spots have a distinct color (Eck, Gersh,
and Taylor, 2000)