Graphics Reference
In-Depth Information
Unfortunately, these techniques result in graphical legends that are not
necessarily self-explanatory to the casual viewer, so you may want to create
one, such as the one in
Figure 6-14
,
using drawing tools (for example,
PowerPoint or Illustrator).
Figure 6-14:
This is a legend for the market basket visualization.
Another alternative is to put a brief text legend below or beside the graph,
such as one including the following:
•
Nodes
indicate products.
•
Node size
indicates product revenue from $0 to $450K.
•
Node color
similarly indicates revenue from $0 (pink) to $450K (deep
purple).
•
Links
indicate pairs of products purchased together.
•
Link width and color
indicate frequency of pairs purchased from 1
(narrow, dark blue) to 500 times (wider and green).
