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314725 (1) [Avatar] Offline
#1
Thanks for a terrific book. One comment, though -- in the gray box in Section 2.3.2, the book states that "if you create a direct correspondence between radius and magnitude, then your readers will be confused, because we tend to recognize the area of a circle rather than its radius," but subsequent examples do exactly that. Why not take the square root? Thanks again.
elijah.meeks (127) [Avatar] Offline
#2
I continue to use circles and radius because calculating area and scaling circles to area is much more difficult for a reader getting into data visualization than just setting the "r" value of the circle. I make the note simply so that readers are aware of the general consensus in the data visualization community that radius does not well express magnitude.