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poole
2008 Mar 25
5
Thinking about using two y-scales on your plot?
Please read this first:
http://www.perceptualedge.com/articles/visual_business_intelligence/dual-scaled_axes.pdf
It's a reasoned discussion of why it's a bad idea and proposes some
alternative methods.
Another good article is:
K. W. Haemer. Double scales are dangerous. The American Statistician,
2(3):24?24, 1948.
People have been advising dual-axis plots for (at least) 60 years!
Hadley