[R] Thinking about using two y-scales on your plot?

[hadley wickham]

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

-- 
http://had.co.nz/