Graphics Reference
In-Depth Information
rates. From each rate, subtract the rate that came the year before, as shown
in Figure 5-41.
You can take it the other direction, and add values, as shown in Figure 5-42.
A step chart shows the monthly cumulative cost of cable over a year versus
the modest cost of Hulu Plus and Netflix. An aggregate at the end shows total
annual savings if you were to switch to the latter.
Straightforward math operations can help you see your data from a different
angle or bring focus to a graphic. Of course, the more statistics you know,
the better you can process and analyze your data, which in turn can lead
to more informative graphics. Account for how people might interpret a
graphic, and if they have to do math in their head to make inferences, it
might be worth the effort to do the math for them and translate the results
visually.
FIGUREĀ 5-40 Transforming data based on point of reference
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